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Jeong JY, Bafor AE, Freeman BH, Chen PR, Park ES, Kim E. Pathophysiology in Brain Arteriovenous Malformations: Focus on Endothelial Dysfunctions and Endothelial-to-Mesenchymal Transition. Biomedicines 2024; 12:1795. [PMID: 39200259 PMCID: PMC11351371 DOI: 10.3390/biomedicines12081795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2024] [Revised: 07/26/2024] [Accepted: 07/29/2024] [Indexed: 09/02/2024] Open
Abstract
Brain arteriovenous malformations (bAVMs) substantially increase the risk for intracerebral hemorrhage (ICH), which is associated with significant morbidity and mortality. However, the treatment options for bAVMs are severely limited, primarily relying on invasive methods that carry their own risks for intraoperative hemorrhage or even death. Currently, there are no pharmaceutical agents shown to treat this condition, primarily due to a poor understanding of bAVM pathophysiology. For the last decade, bAVM research has made significant advances, including the identification of novel genetic mutations and relevant signaling in bAVM development. However, bAVM pathophysiology is still largely unclear. Further investigation is required to understand the detailed cellular and molecular mechanisms involved, which will enable the development of safer and more effective treatment options. Endothelial cells (ECs), the cells that line the vascular lumen, are integral to the pathogenesis of bAVMs. Understanding the fundamental role of ECs in pathological conditions is crucial to unraveling bAVM pathophysiology. This review focuses on the current knowledge of bAVM-relevant signaling pathways and dysfunctions in ECs, particularly the endothelial-to-mesenchymal transition (EndMT).
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Affiliation(s)
| | | | | | | | | | - Eunhee Kim
- Vivian L. Smith Department of Neurosurgery, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA; (J.Y.J.); (A.E.B.); (B.H.F.); (P.R.C.); (E.S.P.)
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2
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Ren J, Cui Z, Jiang C, Wang L, Guan Y, Ren Y, Zhang S, Tu T, Yu J, Li Y, Duan W, Guan J, Wang K, Zhang H, Xing D, Kahn ML, Zhang H, Hong T. GNA14 and GNAQ somatic mutations cause spinal and intracranial extra-axial cavernous hemangiomas. Am J Hum Genet 2024; 111:1370-1382. [PMID: 38917801 PMCID: PMC11267519 DOI: 10.1016/j.ajhg.2024.05.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Revised: 05/20/2024] [Accepted: 05/22/2024] [Indexed: 06/27/2024] Open
Abstract
Extra-axial cavernous hemangiomas (ECHs) are complex vascular lesions mainly found in the spine and cavernous sinus. Their removal poses significant risk due to their vascularity and diffuse nature, and their genetic underpinnings remain incompletely understood. Our approach involved genetic analyses on 31 tissue samples of ECHs employing whole-exome sequencing and targeted deep sequencing. We explored downstream signaling pathways, gene expression changes, and resultant phenotypic shifts induced by these mutations, both in vitro and in vivo. In our cohort, 77.4% of samples had somatic missense variants in GNA14, GNAQ, or GJA4. Transcriptomic analysis highlighted significant pathway upregulation, with the GNAQ c.626A>G (p.Gln209Arg) mutation elevating PI3K-AKT-mTOR and angiogenesis-related pathways, while GNA14 c.614A>T (p.Gln205Leu) mutation led to MAPK and angiogenesis-related pathway upregulation. Using a mouse xenograft model, we observed enlarged vessels from these mutations. Additionally, we initiated rapamycin treatment in a 14-year-old individual harboring the GNAQ c.626A>G (p.Gln209Arg) variant, resulting in gradual regression of cutaneous cavernous hemangiomas and improved motor strength, with minimal side effects. Understanding these mutations and their pathways provides a foundation for developing therapies for ECHs resistant to current therapies. Indeed, the administration of rapamycin in an individual within this study highlights the promise of targeted treatments in treating these complex lesions.
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Affiliation(s)
- Jian Ren
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, China International Neuroscience Institute, National Center for Neurological Disorders, Beijing, China
| | - Ziwei Cui
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, China International Neuroscience Institute, National Center for Neurological Disorders, Beijing, China
| | - Chendan Jiang
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, China International Neuroscience Institute, National Center for Neurological Disorders, Beijing, China
| | - Leiming Wang
- Department of Pathology, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Yunqian Guan
- Cell Therapy Center, Beijing Institute of Geriatrics, Xuanwu Hospital Capital Medical University, National Clinical Research Center for Geriatric Diseases, and Key Laboratory of Neurodegenerative Diseases, Ministry of Education, Beijing, China
| | - Yeqing Ren
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, China International Neuroscience Institute, National Center for Neurological Disorders, Beijing, China
| | - Shikun Zhang
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, China International Neuroscience Institute, National Center for Neurological Disorders, Beijing, China
| | - Tianqi Tu
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, China International Neuroscience Institute, National Center for Neurological Disorders, Beijing, China
| | - Jiaxing Yu
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, China International Neuroscience Institute, National Center for Neurological Disorders, Beijing, China
| | - Ye Li
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, China International Neuroscience Institute, National Center for Neurological Disorders, Beijing, China
| | - Wanru Duan
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, China International Neuroscience Institute, National Center for Neurological Disorders, Beijing, China
| | - Jian Guan
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, China International Neuroscience Institute, National Center for Neurological Disorders, Beijing, China
| | - Kai Wang
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, China International Neuroscience Institute, National Center for Neurological Disorders, Beijing, China
| | - Hongdian Zhang
- Department of Neurosurgery, The Seventh Medical Center of PLA General Hospital, Beijing, China
| | - Dong Xing
- Biomedical Pioneering Innovation Center (BIOPIC), School of Life Sciences, Peking University, Beijing, China; Beijing Advanced Innovation Center for Genomics (ICG), Peking University, Beijing, China
| | - Mark L Kahn
- Department of Medicine and Cardiovascular Institute, University of Pennsylvania, Philadelphia, PA, USA
| | - Hongqi Zhang
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, China International Neuroscience Institute, National Center for Neurological Disorders, Beijing, China.
| | - Tao Hong
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, China International Neuroscience Institute, National Center for Neurological Disorders, Beijing, China; Department of Neurosurgery, Xiongan Xuanwu Hospital, Xiong'an New Area, China.
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Demartini Z, Brigid de Zorzi Dalke D, Teixeira BCA. Cerebrofacial Venous Metameric Syndrome Mimicking Vein of Galen Aneurysmal Malformation. World Neurosurg 2024; 190:12-13. [PMID: 38945210 DOI: 10.1016/j.wneu.2024.06.129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2024] [Revised: 06/22/2024] [Accepted: 06/24/2024] [Indexed: 07/02/2024]
Abstract
Cerebrofacial venous metameric syndrome (CVMS) is a complex low-flow vascular malformation affecting bone and soft tissues including brain, dura mater, and eye. We show images of CVMS in an 18-month-old boy presenting facial venous malformations, developmental venous anomalies, dural sinus malformations, and dilated great cerebral vein, suggesting a vein of Galen aneurysmal malformation. Although Sturge-Weber syndrome is the most known form of CVMS, its presentations are variable and include several venous malformations. Recognizing the various manifestations of CVMS is necessary for adequate screening, treatment, and follow-up.
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Affiliation(s)
- Zeferino Demartini
- Complexo Hospital Pequeno Principe, Curitiba, PR, Brazil; Complexo Hospital de Clínicas, Universidade Federal do Parana, Curitiba, PR, Brazil.
| | | | - Bernardo C A Teixeira
- Complexo Hospital Pequeno Principe, Curitiba, PR, Brazil; Complexo Hospital de Clínicas, Universidade Federal do Parana, Curitiba, PR, Brazil
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Ahmed S, Kunwar D, Khan MH, Akbar A, Yasin A, Anjum AS. Cerebrofacial arteriovenous metameric syndrome type I + II + III: An unusual case. Clin Case Rep 2024; 12:e8692. [PMID: 38515993 PMCID: PMC10954563 DOI: 10.1002/ccr3.8692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2023] [Accepted: 02/22/2024] [Indexed: 03/23/2024] Open
Abstract
Cerebrofacial arteriovenous Metameric syndrome (CAMS) typically manifests as types I, II, or III, occasionally presenting as dual types. Our unique case underscores the coexistence of all three CAMS types in one patient. Furthermore, the concurrent acute cerebellar infarct underscores the need to consider CAMS in the differential diagnosis of adolescents experiencing neurological events.
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Affiliation(s)
- Shahroze Ahmed
- Department of RadiologyNishtar Medical UniversityMultanPakistan
| | | | | | - Anum Akbar
- Department of PediatricsUniversity of Nebraska Medical UniversityOmahaNebraskaUSA
| | - Asra Yasin
- Department of RadiologyNishtar Medical UniversityMultanPakistan
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Nayak MK, Mishra B, Levejoseph S, Garg A, Sarma K, Sahoo B, Tripathi M, Gaikwad SB. Emerging insights into cephalic neural crest disorders: A single center experience. J Clin Imaging Sci 2024; 14:3. [PMID: 38469176 PMCID: PMC10927042 DOI: 10.25259/jcis_87_2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2023] [Accepted: 11/19/2023] [Indexed: 03/13/2024] Open
Abstract
Objectives Neural crest cells (NCCs) are transient structures in the fetal life in vertebrates, which develop at the junctional site of the non-neural and neural ectoderm, sharing a common developmental origin for diverse diseases. After Epithelio-mesenchymal (EMT) of the NCCs within the neural tube, delamination of NCCs occurs. After delamination, the transformation of these cells into various cell lineages produces melanocytes, bones, and cartilage of the skull, cells of the enteric and peripheral nervous system. After the conversion, these cells migrate into various locations of the entire body according to the cell lineage. Abnormalities in neural crest (NC) formation and migration result in various malformations and tumors, known as neurocristopathy. Material and Methods Herein, this case series describes a single-center experience in cephalic NC disorders over the past 3 years, including 17 cases of varying composition (i.e., vascular, dysgenetic, mixed, and neoplastic forms) involving the brain and occasionally skin, eyes, and face of the patients. Results In our study of 17 patients with cephalic NC disease, 6 (35.3%) patients had vascular form, 5 (29.4%) had dysgenetic form, 4 (23.5%) had mixed form, and 2 (11.7%) had neoplastic form. Brain involvement in the form of vascular or parenchyma or both vascular and parenchymal was seen in all of our patients (100%), skin in 6 (35.3%) patients, eye in 2 (11.7%), and face in 1 (5.9%) patient. Treatment was planned according to the various manifestations of the disease. Conclusion Neural crest diseases (NCDs) are a rare and under-recognized group of disorders in the literature and may have been under-reported due to a lack of awareness regarding the same. More such reporting may increase the repertoire of these rare disorders such that clinicians can have a high degree of suspicion leading to early detection and timely counseling and also improve preventive strategies and help in developing new drugs for these disorders or prevent them.
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Affiliation(s)
- Manoj Kumar Nayak
- Department of Radiodiagnosis, All India Institute of Medical Sciences, Bhubaneswar, Odisha, India
| | - Biswamohan Mishra
- Department of Neurology, All India Institute of Medical Sciences, New Delhi, Delhi, India
| | - Sebastian Levejoseph
- Department of Neuroimaging and Interventional Neuroradiology, All India Institute of Medical Sciences, New Delhi, Delhi, India
| | - Ajay Garg
- Department of Neuroimaging and Interventional Neuroradiology, All India Institute of Medical Sciences, New Delhi, Delhi, India
| | - Kalyan Sarma
- Department of Radiology, All India Institute of Medical Sciences, Guwahati, India
| | - Biswajit Sahoo
- Department of Radiodiagnosis, All India Institute of Medical Sciences, Bhubaneswar, Odisha, India
| | - Manjari Tripathi
- Department of Neurology, All India Institute of Medical Sciences, New Delhi, Delhi, India
| | - Shailesh B. Gaikwad
- Department of Neuroimaging and Interventional Neuroradiology, All India Institute of Medical Sciences, New Delhi, Delhi, India
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Barros LL, Lima PLGDSB, de Oliveira Júnior PH, Dias DA, Santos CDF, Braga-Neto P, Nóbrega PR. Peculiar aetiology for orbital apex syndrome: Wyburn-Mason syndrome as orbital apex lesion. BMJ Neurol Open 2024; 6:e000559. [PMID: 38268749 PMCID: PMC10806852 DOI: 10.1136/bmjno-2023-000559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/12/2023] [Indexed: 01/26/2024] Open
Abstract
Background Wyburn-Mason syndrome is a rare, non-hereditary congenital disease, belonging to the group of neurocutaneous syndromes with fewer than 100 cases reported since its first description in 1937. Case report A young adult man was initially evaluated at the age of 2 years for proptosis and progressive visual impairment of the right eye, followed by impairment in ocular abduction, adduction and elevation as well as amaurosis. MRI revealed an expansive formation centred in the right orbit compromising conal spaces with distortion of eye muscles and optic nerve. The lesion extended through the superior orbital fissure into the right cavernous sinus and to the contralateral orbit. Despite embolisation, proptosis and oedema of the periorbital tissue continued to worsen. The combination of facial, ocular and intracranial vascular malformations and the exclusion of alternative aetiologies led to a diagnosis of cerebrofacial arteriovenous metameric syndrome (CAMS) 1 (Wyburn-Mason syndrome). Discussion Important differential diagnoses are other CAMS, such as Sturge-Weber syndrome, as well as other conditions such as retinal cavernous haemangioma and vasoproliferative tumours. The optimal treatment regimen for severe cases of this syndrome is still unclear. Wyburn-Mason syndrome should be considered in patients presenting multiple arteriovenous malformations with orbital apex lesions.
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Affiliation(s)
| | | | | | | | | | - Pedro Braga-Neto
- State University of Ceara, Fortaleza, Brazil
- Department of Clinical Medicine, Federal University of Ceara, Fortaleza, Brazil
| | - Paulo Ribeiro Nóbrega
- Division of Neurology, Federal University of Ceara, Fortaleza, Brazil
- Centro Universitário Christus, Fortaleza, Brazil
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Duarte Armindo R, Vilela P. What the Musculoskeletal Radiologist Needs to Know About the Vascular Anatomy of the Spine and Spinal Cord. Semin Musculoskelet Radiol 2023; 27:580-587. [PMID: 37816366 DOI: 10.1055/s-0043-1772171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/12/2023]
Abstract
This article describes the vascular anatomy of the spine and spinal cord, highlighting key structures and anatomical variations relevant to musculoskeletal radiologists. It covers the arterial and venous drainage systems, along with examples of vascular conditions affecting the spine. Understanding the vascular anatomy of the spine and spinal cord is crucial for accurate interpretation of imaging studies and safe spinal interventional procedures. Imaging techniques for evaluating vascular pathology of the spine are discussed and compared. Understanding vascular anatomy and the most common vascular disorders will lead to an accurate diagnosis and suggest the appropriate type of study needed for further characterization and/or patient management.
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Affiliation(s)
- Rui Duarte Armindo
- Neuroradiology Department, Western Lisbon University Hospital Centre (Centro Hospitalar Universitário Lisboa Ocidental), Lisbon, Portugal
- Neuroradiology Unit, Hospital da Luz Lisboa, Lisbon, Portugal
| | - Pedro Vilela
- Neuroradiology Department, Western Lisbon University Hospital Centre (Centro Hospitalar Universitário Lisboa Ocidental), Lisbon, Portugal
- Neuroradiology Unit, Hospital da Luz Lisboa, Lisbon, Portugal
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8
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Ota T. Functional Vascular Anatomy and Arteriovenous Shunts of the Spine. Semin Neurol 2023; 43:356-369. [PMID: 37536372 DOI: 10.1055/s-0043-1771209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/05/2023]
Abstract
The history of vascular anatomy of the spinal cord and spine began in the late 19th century. With recent advances in endovascular and surgical treatment of vascular lesions of the spinal cord, understanding the vascular anatomy of the spinal cord has become more important than ever. Catheter angiography is the gold standard for diagnosing vascular lesions of the spinal cord, and the vascular architecture of the spinal cord itself is relatively simple, a repetition of basic longitudinal and axial structures. This review discusses the vascular anatomy of the spine and spinal cord from the embryological point of view, as well as an overview of typical spinal arteriovenous shunt diseases mainly depending on their locations: paraspinal, epidural, dural, perimedullary, intramedullary, filum terminale/cauda equina, craniocervical junction, and related diseases.
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Affiliation(s)
- Takahiro Ota
- Department of Neurosurgery, Tokyo Metropolitan Tama Medical Center, Tokyo, Japan
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Iampreechakul P, Chuntaroj S, Wattanasen Y, Hangsapruek S, Lertbutsayanukul P, Siriwimonmas S. Spontaneous regression of extradural high-flow vascular malformation in spinal arteriovenous metameric syndrome (SAMS): A unique case report. Surg Neurol Int 2023; 14:163. [PMID: 37292406 PMCID: PMC10246388 DOI: 10.25259/sni_4_2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Accepted: 04/19/2023] [Indexed: 06/10/2023] Open
Abstract
Background Spinal arteriovenous metameric syndrome (SAMS) is a rare nonhereditary genetic vascular disorder, involving multiple layers of tissues in the same metameric level. Spontaneous regression of SAMS has never been reported in the medical literature. Case Description A 42-year-old woman presented with intermittent low back pain for 6 months. Magnetic resonance imaging of the thoracolumbar spine incidentally found clusters of spinal vascular malformations involving spinal cord, vertebral bodies, epidural space, and paraspinal muscles. There was no sign of venous congestion. Magnetic resonance angiography and spinal angiography revealed intradural spinal cord arteriovenous malformation (SCAVM) at the level of T10-11 and extradural high-flow osseous arteriovenous fistula. Due to asymptomatic SAMS and a high risk of anterior spinal arterial compromise during treatment, conservative treatment was considered in our patient. Spinal angiography obtained 8 years after initial angiography demonstrated significant regression of extradural component of SAMS and stable intradural SCAVM. Conclusion We describe a unique case of SAMS with spontaneous regression of extradural component during a long-term observation period.
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Affiliation(s)
| | - Songpol Chuntaroj
- Department of Neuroradiology, Neurological Institute of Thailand, Bangkok, Thailand
| | - Yodkhwan Wattanasen
- Department of Neuroradiology, Neurological Institute of Thailand, Bangkok, Thailand
| | - Sunisa Hangsapruek
- Department of Neuroradiology, Neurological Institute of Thailand, Bangkok, Thailand
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Vaithialingam B, Gopal S, Sohrab M. Catheter Embolization of an Orbital Arteriovenous Fistula in a Patient With Wyburn-Mason Syndrome. Cureus 2023; 15:e36949. [PMID: 37131550 PMCID: PMC10149032 DOI: 10.7759/cureus.36949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/30/2023] [Indexed: 04/03/2023] Open
Abstract
A 24-year-old female presented to the emergency department with swelling of the forehead and oculus sinister. A soft, compressible glabellar swelling with proptosis of the oculus sinister was noted on clinical examination. Cerebral angiography revealed a left medial orbital wall arteriovenous fistula with feeders from the left internal maxillary artery, left superficial temporal artery, and left ophthalmic artery. During the cerebral angiography, a diffuse intracranial venous anomaly and left basal ganglia arteriovenous malformations were also noted. A diagnosis of Wyburn-Mason syndrome was made, and the patient underwent catheter embolization of the orbital arteriovenous fistula. After glue embolization of the left external carotid artery feeders, the patient experienced a 50% reduction in glabellar swelling in the immediate postoperative period. Glue embolization of the left ophthalmic artery feeder was planned after six months during the follow-up period.
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Muacevic A, Adler JR. Management of Brain Arteriovenous Malformations: A Review. Cureus 2023; 15:e34053. [PMID: 36824547 PMCID: PMC9942537 DOI: 10.7759/cureus.34053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/22/2023] [Indexed: 01/23/2023] Open
Abstract
Brain arteriovenous malformations (bAVM) are vascular malformations of the brain affecting all ages. The optimum management strategy is essentially devoid of high-quality evidence and is highly nuanced and embedded in local customs. This study summarizes the frequently employed management strategies, drawing conclusions on the utility of each method of treatment and delving into controversies surrounding them. A literature search on PubMed and Medline was done on January 3rd, 2022. 11,767 articles were found, and abstracts were reviewed. Full-text review of 153 articles led to chapters from three books and 71 articles incorporated into a summative discussion. Spetzler-Ponce (S-P) Class A patients may be offered surgery if they are good surgical candidates and have a good number of high-quality years of life left. The exception is diffuse Spetzler-Martin (S-M) grade 2 in a patient older than 40 years: radiosurgery for unruptured and embolization for ruptured. S-P Class B may be offered surgery if a compact nidus or if younger than 40 years. If diffuse or age greater than 40, radiosurgery may be preferred if the Pollock-Flickinger score is less than 2.5. For the remainder of S-P Class B, conservative management may be preferred. S-P Class C is generally not treated unless young or those patients with poorly controlled seizures affecting their quality of life are willing to risk permanent neurological deficits. While the quality of studies is generally high, the level of evidence is concerning with only one randomized controlled trial (RCT). Most research output hails from high-income countries, i.e., perhaps not universally applicable to all settings owing to possible genetic, environmental, and resource differences. More research is needed: large volume studies in the pregnant population, validation of scoring systems in pediatric age groups, clinical trials focused on combination multi-staged treatment modalities, and studies originating from the developing world.
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Hug NF, Purger DA, Moss HE, Dodd RL. Pituitary macroadenoma causing vision loss in Wyburn-Mason syndrome: illustrative case. JOURNAL OF NEUROSURGERY. CASE LESSONS 2022; 4:CASE22236. [PMID: 36572974 PMCID: PMC9795825 DOI: 10.3171/case22236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 11/10/2022] [Indexed: 12/27/2022]
Abstract
BACKGROUND Wyburn-Mason syndrome (WMS) is a neurocutaneous disorder consisting of vascular malformations of the brain, eye, and skin. These include characteristically high-flow intracranial and intraorbital arteriovenous malformations (AVMs) that present commonly with visual deterioration, headache, and hemiplegia. Complete removal of these lesions is challenging. Most patients are followed closely, and intervention occurs only in the setting of worsening symptoms secondary to AVM growth or hemorrhage. Here the authors present the first known case of a patient with WMS and a pituitary macroadenoma. OBSERVATIONS A 62-year-old man with a 30-year history of WMS with right basal ganglia and orbital AVMs and right eye blindness presented for new-onset left-sided vision loss. A pituitary adenoma was identified compressing the optic chiasm and left optic nerve. Magnetic resonance imaging and digital subtraction angiography studies were obtained for surgical planning, and the patient underwent an endoscopic transnasal transsphenoidal resection, with significant postoperative vision improvement. LESSONS Given the variable presentation and poor characterization of this rare syndrome, patients with WMS presenting with new symptoms must undergo evaluation for growth and hemorrhage of known AVMs, as well as new lesions. Further, in patients undergoing intracranial surgery, extensive preoperative imaging and planning are crucial for safe and successful procedures.
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Affiliation(s)
| | | | | | - Robert L. Dodd
- Departments of Neurosurgery, ,Neuroradiology, Stanford University School of Medicine, Stanford, California
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13
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Chauhan G, Israrahmed A, Agarwal R, Pandey A. Cerebrofacial venous metameric syndrome (CVMS) type I: constellation of imaging and clinical findings. BMJ Case Rep 2022; 15:e252502. [PMID: 36332933 PMCID: PMC9639023 DOI: 10.1136/bcr-2022-252502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Affiliation(s)
- Gaurav Chauhan
- Radiology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, India
- Intervention Radiology, Medanta The Medicity, Gurgaon, India
| | | | - Rohit Agarwal
- Radiodiagnosis, Medanta The Medicity, Gurgaon, India
| | - Amitesh Pandey
- Neuroanesthesia, Medanta The Medicity, Gurgaon, India
- Neuroanesthesia, Medanta The Medicity, Gurgaon, India
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14
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Peer S, Kaur S, Singh P, Kaur H, Kaur N, Kumar K, Singh R. Cerebrofacial venous metameric syndrome type 2+3: face is the index of brain. Radiol Case Rep 2022; 18:126-130. [PMID: 36340223 PMCID: PMC9630619 DOI: 10.1016/j.radcr.2022.10.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2022] [Revised: 09/30/2022] [Accepted: 10/03/2022] [Indexed: 11/23/2022] Open
Abstract
We describe a rare case of a 20-year-old man who presented with an extensive facial and orbital venous malformation associated with multiple intracranial venous malformations. The co-existence of cerebrofacial venous malformations points towards a common final pathway in development of these malformations. Our findings are consistent with few previous similar case descriptions. In addition, we describe some novel observations which, to the best of our knowledge, have not been described in the literature. This case reinforces the concept of metameric and segmental distribution of cerebrofacial vasculature, and the aberrations thereof leading to the metameric venous malformations, as proposed by Lasjaunias et al.
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Larson AS, Brinjikji W, Krings T, Guerin JB. The cerebrofacial metameric syndromes: An embryological review and proposal of a novel classification scheme. Interv Neuroradiol 2022; 28:595-603. [PMID: 34665049 PMCID: PMC9511621 DOI: 10.1177/15910199211044938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 08/09/2021] [Accepted: 08/20/2021] [Indexed: 11/15/2022] Open
Abstract
The cerebrofacial metameric syndromes are a group of congenital syndromes that result in vascular malformations throughout specific anatomical distributions of the brain, cranium and face. Multiple reports of patients with high-flow or low-flow vascular malformations following a metameric distribution have supported this idea. There has been much advancement in understanding of segmental organization and cell migration since the concept of metameric vascular syndromes was first proposed. We aim to give an updated review of these embryological considerations and then propose a more detailed classification system for these syndromes, predominately incorporating the contribution of neural crest cells and somitomeres to the pharyngeal arches.
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Affiliation(s)
| | - Waleed Brinjikji
- Department of Radiology, Mayo Clinic, USA
- Department of Neurosurgery, Mayo Clinic, USA
| | - Timo Krings
- Division of Neuroradiology, University of Toronto and Toronto Western Hospital, Canada
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16
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Genetics and Emerging Therapies for Brain Arteriovenous Malformations. World Neurosurg 2022; 159:327-337. [PMID: 35255632 DOI: 10.1016/j.wneu.2021.10.127] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 10/14/2021] [Accepted: 10/15/2021] [Indexed: 11/27/2022]
Abstract
Brain arteriovenous malformations (AVMs) are characterized by a high-pressure, low-resistance vascular nidus created by direct shunting of blood from feeding arteries into arterialized veins, bypassing intervening capillaries. AVMs pose a risk of spontaneous rupture because the vessel walls are continuously exposed to increased shear stress and abnormal flow phenomena, which lead to vessel wall inflammation and distinct morphologic changes. The annual rupture rate is estimated at 2%, and once an AVM ruptures, the risk of rerupture increases 5-fold. The ability of AVMs to grow, regress, recur, and undergo remodeling shows their dynamic nature. Identifying the underlying cellular and molecular pathways of AVMs not only helps us understand their natural physiology but also allows us to directly block vital pathways, thus preventing AVM development and progression. Management of AVMs is challenging and often necessitates a multidisciplinary approach, including neurosurgical, endovascular, and radiosurgical expertise. Because many of these procedures are invasive, carry a risk of inciting hemorrhage, or are controversial, the demand for pharmacologic treatment options is increasing. In this review, we introduce novel findings of cellular and molecular AVM physiology and highlight key signaling mediators that are potential targets for AVM treatment. Furthermore, we give an overview of syndromes associated with hereditary and nonhereditary AVM formation and discuss causative genetic alterations.
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17
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Klostranec JM, Krings T. Cerebral neurovascular embryology, anatomic variations, and congenital brain arteriovenous lesions. J Neurointerv Surg 2022; 14:910-919. [PMID: 35169032 DOI: 10.1136/neurintsurg-2021-018607] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Accepted: 01/10/2022] [Indexed: 12/14/2022]
Abstract
Cerebral neurovascular development is a complex and coordinated process driven by the changing spatial and temporal metabolic demands of the developing brain. Familiarity with the process is helpful in understanding neurovascular anatomic variants and congenital arteriovenous shunting lesions encountered in endovascular neuroradiological practice. Herein, the processes of vasculogenesis and angiogenesis are reviewed, followed by examination of the morphogenesis of the cerebral arterial and venous systems. Common arterial anatomic variants are reviewed with an emphasis on their development. Finally, endothelial genetic mutations affecting angiogenesis are examined to consider their probable role in the development of three types of congenital brain arteriovenous fistulas: vein of Galen malformations, pial arteriovenous fistulas, and dural sinus malformations.
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Affiliation(s)
- Jesse M Klostranec
- Department of Neuroradiology, Montreal Neurological Institute and Hospital, Montreal, Quebec, Canada .,McGill University Health Centre, Montreal, Quebec, Canada
| | - Timo Krings
- Division of Neuroradiology, Department of Medical Imaging and Division of Neurosurgery, Department of Surgery, Toronto Western Hospital, University Health Network, Toronto, Ontario, Canada
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18
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Colafati GS, Piccirilli E, Marrazzo A, Carboni A, Diociaiuti A, El Hachem M, Esposito F, Zama M, Rollo M, Gandolfo C, Tomà P. Vascular lesions of the pediatric orbit: A radiological walkthrough. Front Pediatr 2022; 10:734286. [PMID: 36533238 PMCID: PMC9748295 DOI: 10.3389/fped.2022.734286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 11/03/2022] [Indexed: 12/05/2022] Open
Abstract
Vascular anomalies of the pediatric orbit represent a heterogeneous group that include both vascular tumors and vascular malformations. The disorder may initially be silent and then associated with symptoms and/or function damage, depending on the type of vascular anomaly and its extension. Vascular tumors include benign, locally aggressive (or borderline) and malignant forms while vascular malformations are divided into "simple", "combined" and syndromic, or "low flow" or "high flow". Both entities can arise in isolation or as part of syndromes. In this review, we describe the imaging findings of the vascular lesions of the orbit in the pediatric population, which are key to obtain a correct diagnosis and to guide the appropriate treatment in the light of the new genetic and molecular discoveries, and the role of the radiologist in their multidisciplinary management. We will also touch upon the main syndromes associated with orbital vascular abnormalities.
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Affiliation(s)
| | - Eleonora Piccirilli
- Department of Neuroscience, Imaging and Clinical Science, University "G. d'Annunzio" of Chieti, Chieti, Italy
| | - Antonio Marrazzo
- Neuroradiology Unit, Department of Imaging, IRCCS Bambino Gesù Children's Hospital, Rome, Italy
| | - Alessia Carboni
- Neuroradiology Unit, Department of Imaging, IRCCS Bambino Gesù Children's Hospital, Rome, Italy
| | - Andrea Diociaiuti
- Dermatology Unit and Genodermatosis Unit, Genetics and Rare Diseases Research Division, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - May El Hachem
- Dermatology Unit and Genodermatosis Unit, Genetics and Rare Diseases Research Division, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Francesco Esposito
- Department of Radiology, Santobono-Pausilipon Children Hospital, Naples, Italy
| | - Mario Zama
- Craniofacial Centre-Plastic and Maxillofacial Surgery Unit, IRCCS Bambino Gesù Children's Hospital, Rome, Italy
| | - Massimo Rollo
- Department of Imaging, IRCCS Bambino Gesù Children's Hospital, Rome, Italy
| | - Carlo Gandolfo
- Neuroradiology Unit, Department of Imaging, IRCCS Bambino Gesù Children's Hospital, Rome, Italy
| | - Paolo Tomà
- Department of Imaging, IRCCS Bambino Gesù Children's Hospital, Rome, Italy
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19
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Sheppard SE, Sanders VR, Srinivasan A, Finn LS, Adams D, Elton A, Amlie-Lefond C, Nelson Z, Dmyterko V, Jensen D, Zenner K, Perkins J, Bennett JT. Cerebrofacial vascular metameric syndrome is caused by somatic pathogenic variants in PIK3CA. Cold Spring Harb Mol Case Stud 2021; 7:mcs.a006147. [PMID: 34887309 PMCID: PMC8751408 DOI: 10.1101/mcs.a006147] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Accepted: 09/30/2021] [Indexed: 12/26/2022] Open
Abstract
Disorganized morphogenesis of arteries, veins, capillaries, and lymphatic vessels results in vascular malformations. Most individuals with isolated vascular malformations have postzygotic (mosaic), activating pathogenic variants in a handful of oncogenes within the PI3K–RAS–MAPK pathway (Padia et al., Laryngoscope Investig Otolaryngol 4: 170–173 [2019]). Activating pathogenic variants in the gene PIK3CA, which encodes for the catalytic subunit of phosphatidylinositol 3-kinase, are present in both lymphatic and venous malformations as well as arteriovenous malformations in other complex disorders such as CLOVES syndrome (congenital, lipomatous, overgrowth, vascular malformations, epidermal anevi, scoliosis) (Luks et al., Pediatr Dev Pathol 16: 51 [2013]; Luks et al., J Pediatr 166: 1048–1054.e1–5 [2015]; Al-Olabi et al., J Clin Invest 128: 1496–1508 [2018]). These vascular malformations are part of the PIK3CA-related overgrowth spectrum, a spectrum of entities that have regionalized disordered growth due to the presence of tissue-restricted postzygotic PIK3CA pathogenic variants (Keppler-Noreuil et al., Am J Med Genet A 167A: 287–295 [2015]). Cerebrofacial vascular metameric syndrome (CVMS; also described as cerebrofacial arteriovenous metameric syndrome, Bonnet–Dechaume–Blanc syndrome, and Wyburn–Mason syndrome) is the association of retinal, facial, and cerebral vascular malformations (Bhattacharya et al., Interv Neuroradiol 7: 5–17 [2001]; Krings et al., Neuroimaging Clin N Am 17: 245–258 [2007]). The segmental distribution, the presence of tissue overgrowth, and the absence of familial recurrence are all consistent with CVMS being caused by a postzygotic mutation, which has been hypothesized by previous authors (Brinjiki et al., Am J Neuroradiol 39: 2103–2107 [2018]). However, the genetic cause of CVMS has not yet been described. Here, we present three individuals with CVMS and mosaic activating pathogenic variants within the gene PIK3CA. We propose that CVMS be recognized as part of the PIK3CA-related overgrowth spectrum, providing justification for future trials using pharmacologic PIK3CA inhibitors (e.g., alpelisib) for these difficult-to-treat patients.
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Affiliation(s)
- Sarah E Sheppard
- Division of Human Genetics, Department of Pediatrics, Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104, USA.,Comprehensive Vascular Anomaly Program, Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104, USA
| | - Victoria R Sanders
- Division of Human Genetics, Department of Pediatrics, Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104, USA.,Comprehensive Vascular Anomaly Program, Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104, USA
| | - Abhay Srinivasan
- Comprehensive Vascular Anomaly Program, Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104, USA.,Division of Interventional Radiology, Department of Radiology, Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104, USA
| | - Laura S Finn
- Department of Pathology, Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104, USA
| | - Denise Adams
- Comprehensive Vascular Anomaly Program, Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104, USA.,Division of Oncology, Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104, USA
| | - Andrew Elton
- University of Minnesota School of Medicine, Minneapolis, Minnesota 55455, USA
| | | | - Zoe Nelson
- Seattle Children's Hospital, Division of Genetic Medicine, Department of Pediatrics, University of Washington, Seattle, Washington 98105, USA
| | - Victoria Dmyterko
- Center for Developmental Biology and Regenerative Medicine, Seattle Children's Research Institute, Seattle, Washington 98101, USA
| | - Dana Jensen
- Center for Developmental Biology and Regenerative Medicine, Seattle Children's Research Institute, Seattle, Washington 98101, USA
| | - Kaitlyn Zenner
- Seattle Children's Hospital, Division of Pediatric Otolaryngology, Department of Otolaryngology/Head and Neck Surgery, University of Washington, Seattle, Washington 98105, USA.,Vascular Anomalies Program, Seattle Children's Hospital, Seattle, Washington 98105, USA
| | - Jonathan Perkins
- Seattle Children's Hospital, Division of Pediatric Otolaryngology, Department of Otolaryngology/Head and Neck Surgery, University of Washington, Seattle, Washington 98105, USA.,Vascular Anomalies Program, Seattle Children's Hospital, Seattle, Washington 98105, USA
| | - James T Bennett
- Seattle Children's Hospital, Division of Genetic Medicine, Department of Pediatrics, University of Washington, Seattle, Washington 98105, USA.,Center for Developmental Biology and Regenerative Medicine, Seattle Children's Research Institute, Seattle, Washington 98101, USA.,Vascular Anomalies Program, Seattle Children's Hospital, Seattle, Washington 98105, USA
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20
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Srivastava T, Gandhi A. A rare case of cerebral proliferative angiopathy with acute cerebral infarction and facial capillary malformation. Neuroradiol J 2021; 35:504-507. [PMID: 34550835 PMCID: PMC9437504 DOI: 10.1177/19714009211042884] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
We are describing a case of a 14-year-old girl who developed acute cerebral infarction which was documented on diffusion-weighted magnetic resonance imaging (DWI). On detailed evaluation, diagnosis of cerebral proliferative angiopathy (CPA) was made. Incidentally, she had capillary malformation on the forehead contralateral to cerebral vascular malformation. To our knowledge, this is the first case of CPA in the literature where DWI abnormality was due to acute cerebral infarction.
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Affiliation(s)
| | - Ashok Gandhi
- Department of Neurosurgery, SMS Medical College, India
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21
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Larson AS, Brinjikji W, Anderson KR, Tollefson M, Michelle Silvera V, Guerin JB. Imaging of benign cervicofacial vascular anomalies and associated syndromes. Interv Neuroradiol 2021; 28:364-374. [PMID: 34397285 DOI: 10.1177/15910199211034989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Cervicofacial vascular anomalies can result in morbidity, pain, and cosmetic concerns in affected individuals. Each anomaly has its own unique natural history, treatment, and associations with underlying genetic syndromes. For optimal patient care, it is important for the neuroradiologist to accurately recognize and characterize these entities to ensure appropriate treatment and management. In this review, we discuss the general characteristics, classifications, and imaging features associated with the most common vascular anomalies such as hemangiomas, arteriovenous malformations and fistulas, capillary malformations, venous malformations, and lymphatic malformations in the context of associated syndromes. Additionally, we discuss novel imaging techniques that aid in identifying these vascular anomalies.
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Affiliation(s)
| | - Waleed Brinjikji
- Department of Radiology, 6915Mayo Clinic, USA.,Department of Neurosurgery, 6915Mayo Clinic, USA
| | | | - Megha Tollefson
- Department of Dermatology, 6915Mayo Clinic, USA.,Department of Pediatric & Adolescent Medicine, 6915Mayo Clinic, USA
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22
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Song Y, Kwon B, Al-Abdulwahhab AH, Nam YK, Ahn Y, Jeong SY, Seo EJ, Lee JK, Suh DC. Rare Neurovascular Diseases in Korea: Classification and Related Genetic Variants. Korean J Radiol 2021; 22:1379-1396. [PMID: 34047503 PMCID: PMC8316781 DOI: 10.3348/kjr.2020.1171] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2020] [Revised: 12/07/2020] [Accepted: 01/23/2021] [Indexed: 01/19/2023] Open
Abstract
Rare neurovascular diseases (RNVDs) have not been well-recognized in Korea. They involve the central nervous system and greatly affect the patients' lives. However, these diseases are difficult to diagnose and treat due to their rarity and incurability. We established a list of RNVDs by referring to the previous literature and databases worldwide to better understand the diseases and their current management status. We categorized 68 RNVDs based on their pathophysiology and clinical manifestations and estimated the prevalence of each disease in Korea. Recent advances in genetic, molecular, and developmental research have enabled further understanding of these RNVDs. Herein, we review each disease, while considering its classification based on updated pathologic mechanisms, and discuss the management status of RNVD in Korea.
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Affiliation(s)
- Yunsun Song
- Division of Neurointervention Clinic, Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Boseong Kwon
- Division of Neurointervention Clinic, Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Abdulrahman Hamed Al-Abdulwahhab
- Department of Diagnostic and Interventional Radiology, Imam Abdulrahman Bin Faisal University, King Fahd Hospital of the University, Al-Khobar City, Eastern Province, Saudi Arabia
| | - Yeo Kyoung Nam
- Division of Neurointervention Clinic, Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Yura Ahn
- Division of Neurointervention Clinic, Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - So Yeong Jeong
- Division of Neurointervention Clinic, Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Eul Ju Seo
- Department of Laboratory Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Jong Keuk Lee
- Asan Institute of Life Sciences, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Dae Chul Suh
- Division of Neurointervention Clinic, Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
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23
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Piria R, Rommel F, Zimbelmann M, Erikson K, Babst N, Brosig A, Freitag JC, Ranjbar M, Grisanti S, Kakkassery V. [Retinal tumors in adults - Part 1: vascular tumors of the retina]. Ophthalmologe 2021; 118:1057-1062. [PMID: 34309716 DOI: 10.1007/s00347-021-01445-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Revised: 05/10/2021] [Accepted: 06/08/2021] [Indexed: 10/20/2022]
Abstract
Retinal tumors are a heterogeneous group of congenital and acquired lesions. In this review series the important retinal tumors are discussed and presented in two articles. In the first part of the article the most important vascular tumors of the retina are presented. Even with benign tumors visual symptoms, such as exudative retinal detachment occur, which often lead to irreversible visual impairments. Because visual symptoms are often a manifestation of systemic diseases, the ophthalmologist plays an important role in the accurate and early diagnosis of retinal tumors. This article reviews the most important clinical and diagnostic features of retinal vascular tumors in adults, their systemic associations and the literature on currently available treatment strategies.
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Affiliation(s)
- Roya Piria
- Klink für Augenheilkunde, Universitätsklinikum Schleswig-Holstein, Campus Lübeck, Ratzeburger Allee 160, 23538, Lübeck, Deutschland.
| | - Felix Rommel
- Klink für Augenheilkunde, Universitätsklinikum Schleswig-Holstein, Campus Lübeck, Ratzeburger Allee 160, 23538, Lübeck, Deutschland
| | - Michael Zimbelmann
- Klink für Augenheilkunde, Universitätsklinikum Schleswig-Holstein, Campus Lübeck, Ratzeburger Allee 160, 23538, Lübeck, Deutschland
| | - Kristina Erikson
- Klink für Augenheilkunde, Universitätsklinikum Schleswig-Holstein, Campus Lübeck, Ratzeburger Allee 160, 23538, Lübeck, Deutschland
| | - Neele Babst
- Klink für Augenheilkunde, Universitätsklinikum Schleswig-Holstein, Campus Lübeck, Ratzeburger Allee 160, 23538, Lübeck, Deutschland
| | - Anton Brosig
- Klink für Augenheilkunde, Universitätsklinikum Schleswig-Holstein, Campus Lübeck, Ratzeburger Allee 160, 23538, Lübeck, Deutschland
| | - Josephine Christin Freitag
- Klink für Augenheilkunde, Universitätsklinikum Schleswig-Holstein, Campus Lübeck, Ratzeburger Allee 160, 23538, Lübeck, Deutschland
| | - Mahdy Ranjbar
- Klink für Augenheilkunde, Universitätsklinikum Schleswig-Holstein, Campus Lübeck, Ratzeburger Allee 160, 23538, Lübeck, Deutschland
| | - Salvatore Grisanti
- Klink für Augenheilkunde, Universitätsklinikum Schleswig-Holstein, Campus Lübeck, Ratzeburger Allee 160, 23538, Lübeck, Deutschland
| | - Vinodh Kakkassery
- Klink für Augenheilkunde, Universitätsklinikum Schleswig-Holstein, Campus Lübeck, Ratzeburger Allee 160, 23538, Lübeck, Deutschland
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24
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Khalid SH, Khan Y, Bashir S, Awan SI, Mustafa S, Bari ME. Endovascular Management of Type III Perimedullary Spinal Arteriovenous Malformations in Pediatric Population. Pediatr Neurosurg 2021; 56:385-391. [PMID: 34077932 DOI: 10.1159/000516445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Accepted: 04/11/2021] [Indexed: 11/19/2022]
Abstract
BACKGROUND Spinal arteriovenous malformations (AVMs) are a cause of 20-30 of all spinal vascular malformation. The treatment option for the AVM depends upon the type of AVM. Here, we present a case series to discuss the type, management, and post-operative conclusion of the spinal AVMs. METHOD Four patients with spinal AVMs were retrospectively reviewed. All 4 patients were with a nidus-type AVM. Treatment for all patients required embolization. Clinical features, imaging, treatment, and clinical results were observed. All 4 patient's clinical outcome was assessed using the Modified Ranked Scale. RESULT The follow-up after management showed that all four-patient recovered without any residual deficit. All four-patient scored zero (0) on the Modified Ranked Scale. CONCLUSION Pediatric spinal AVMs are rare and require complex multimodal approach to achieve favorable outcomes.
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Affiliation(s)
- Syed Hassan Khalid
- Department of Neurosurgery, Aga Khan University Hospital, Karachi, Pakistan,
| | - Yakoot Khan
- Department of Neurosurgery, Aga Khan University Hospital, Karachi, Pakistan
| | - Sanaullah Bashir
- Department of Neurosurgery, Aga Khan University Hospital, Karachi, Pakistan
| | - Saba Iqbal Awan
- Department of Neurosurgery, Aga Khan University Hospital, Karachi, Pakistan
| | - Saleem Mustafa
- Department of Neurosurgery, Aga Khan University Hospital, Karachi, Pakistan
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25
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The lump of the medial canthus as diagnostic clue to cerebro-facial venous metameric syndrome: Report of a case. North Clin Istanb 2020; 7:508-511. [PMID: 33163889 PMCID: PMC7603845 DOI: 10.14744/nci.2020.02259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Accepted: 06/15/2020] [Indexed: 11/23/2022] Open
Abstract
The Cerebro-Facial Venous Metameric Syndrome is characterized by ipsilateral venous/lymphatic anomalies involving simultaneously the brain and the face with a metameric distribution. This case report to describe a case of Cerebro-Facial Venous Metameric Syndrome presenting with a lump of the medial canthus. This was a case report a 24-year-old woman with a history of a mild headache, complained of a sporadic (at least once a month) serous leakage from the left eye and a small cutaneous protuberance in the left medial canthus, without focal neurological symptoms. The patient underwent brain Magnetic Resonance Imaging and findings were suggestive of a Cerebro-Facial Venous Metameric Syndrome 1-2. When multiple and ipsilateral vascular anomalies are observed, it should be considered the presence of Cerebro-Facial Metameric Syndrome, even without neurological symptoms and port-wine stains. Follow-up is mandatory, especially if there are cavernomas or facial arterio-venous malformations due to the risk of bleeding.
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26
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The Natural History of Retinal Vascular Changes from Infancy to Adulthood in Wyburn-Mason Syndrome. Medicina (B Aires) 2020; 56:medicina56110598. [PMID: 33182356 PMCID: PMC7695326 DOI: 10.3390/medicina56110598] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 11/04/2020] [Accepted: 11/06/2020] [Indexed: 11/20/2022] Open
Abstract
Wyburn-Mason syndrome is a rare, non-hereditary congenital neurocutaneous disorder leading to arteriovenous malformations. Malformations are characterized by an artery that is directly connected to veins without a capillary system and forms a fragile mass of abnormal vessels. It can be found in the midbrain, in the eyes, orbit, and rarely in cutaneous nevi. Neurological and ocular symptoms are the most common. Ocular signs and symptoms include abnormally dilatated vessels of conjunctiva, nystagmus, strabismus, vitreous hemorrhage, vein occlusions, retinal detachment, etc. Neurological symptoms may include headaches, paralysis, epistaxis, hydrocephalus, and hemiparesis. Imaging modalities such as MRI/CT angiography, optical coherence angiography, and fluorescein angiography are the most important for the identification of arteriovenous malformations. In our case report, we present an eight-month-old girl with an incidental finding of retinal angiomatosis on the left eye and was subsequently diagnosed with Wyburn-Mason syndrome. We compare the findings from the first visit to her clinical findings 20 years later.
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27
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Mishra B, Vishnu VY, Gupta A, Garg A, Saxena R, Rajan R, Bhatia R, Singh MB, Srivastava MP. Teaching NeuroImages: An oculocerebral metameric syndrome. Neurology 2020; 95:e2458-e2459. [DOI: 10.1212/wnl.0000000000010425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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28
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Comprehensive Treatment and Vascular Architecture Characteristic of High-Flow Vascular Malformations in Periorbital Regions. J Craniofac Surg 2020; 32:187-192. [PMID: 32969925 DOI: 10.1097/scs.0000000000007088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Abstract
OBJECTIVE This study analyzed the vascular architecture characteristics of high-flow vascular malformations (VMs) in periorbital regions, as well as the treatment and imaging prognosis of occlusion degree of the outflow veins. METHOD The clinical data of 24 patients with high-flow VMs in periorbital regions treated in our center from 2012 to 2019 were analyzed retrospectively, and the vascular architecture characteristics, treatment methods, and follow-up results were recorded. RESULTS The vascular architecture of high-flow VMs in periorbital regions which usually contained the intracranial feeding arteries (24/24,100.0%) and intracranial outflow veins (18/24, 75.0%). The average age of first diagnosis was 23 ± 16 years; the average age of treatment was 37 ± 10 years; the median follow-up time was 42.5 months. Twenty-four patients with high-flow VMs in periorbital regions had 58 treatments in all. The imaging cure was achieved in 6 patients by complete occlusion of outflow veins, and no recurrence was found by DSA. Eighteen patients who get incomplete occlusion of outflow veins were given 49 treatments, and 8 patients had imaging recurrence. Seven patients (7/24, 29.2%) had treatment-related complications in all. CONCLUSIONS Patients with high-flow VMs in periorbital regions are the most complex cases. The prognosis of patients whose outflow veins can be completely occluded is relatively good. The stepwise embolization while preserving organ function is advisable. Nevertheless, the incidence of treatment complications is still high.
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29
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Ouédraogo M, Lorette G, Morel B, Herbreteau D, Maruani A, Leducq S. Long‐term follow‐up of intracranial arteriovenous malformations with frontal capillary malformation (Wyburn‐Mason syndrome or Bonnet‐Dechaume‐Blanc syndrome): three case reports. Int J Dermatol 2020; 59:e276-e278. [DOI: 10.1111/ijd.14947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 03/26/2020] [Accepted: 04/22/2020] [Indexed: 11/30/2022]
Affiliation(s)
- Muriel Ouédraogo
- Department of Dermatology CHU Yalgado Ouédraogo Ouagadougou Burkina Faso
- Reference Center for Rare Diseases and Vascular Malformations (MAGEC) CHRU Tours Tours Cedex 9 France
- Department of Dermatology CHRU Tours Tours Cedex 9 France
| | - Gérard Lorette
- Reference Center for Rare Diseases and Vascular Malformations (MAGEC) CHRU Tours Tours Cedex 9 France
- Department of Dermatology CHRU Tours Tours Cedex 9 France
- University of Tours Tours France
| | - Baptiste Morel
- Reference Center for Rare Diseases and Vascular Malformations (MAGEC) CHRU Tours Tours Cedex 9 France
- University of Tours Tours France
- Department of Pediatric Radiology CHRU Tours Tours France
| | - Denis Herbreteau
- Reference Center for Rare Diseases and Vascular Malformations (MAGEC) CHRU Tours Tours Cedex 9 France
- University of Tours Tours France
- Department of Neuroradiology and Interventional Radiology CHRU Tours Tours France
| | - Annabel Maruani
- Reference Center for Rare Diseases and Vascular Malformations (MAGEC) CHRU Tours Tours Cedex 9 France
- Department of Dermatology CHRU Tours Tours Cedex 9 France
- Universities of Tours and Nantes INSERM 1246 – SPHERE Tours France
| | - Sophie Leducq
- Reference Center for Rare Diseases and Vascular Malformations (MAGEC) CHRU Tours Tours Cedex 9 France
- Department of Dermatology CHRU Tours Tours Cedex 9 France
- Universities of Tours and Nantes INSERM 1246 – SPHERE Tours France
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Brinjikji W, Mark IT, Silvera VM, Guerin JB. Cervicofacial Venous Malformations Are Associated with Intracranial Developmental Venous Anomalies and Dural Venous Sinus Abnormalities. AJNR Am J Neuroradiol 2020; 41:1209-1214. [PMID: 32586966 DOI: 10.3174/ajnr.a6617] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2020] [Accepted: 04/23/2020] [Indexed: 12/28/2022]
Abstract
BACKGROUND AND PURPOSE Prior studies have suggested an association between the presence of cervicofacial venous malformations and intracranial developmental venous anomalies. We reviewed our institutional cohort of patients with cervicofacial venous malformations and examined the spectrum of intracranial venous anomalies, including developmental venous anomalies, cavernous malformations, and dural venous sinus abnormalities. MATERIALS AND METHODS Consecutive patients who presented to our institution with cervicofacial venous malformations and underwent postcontrast MR imaging were studied. Three neuroradiologists reviewed brain MRIs for the presence of developmental venous anomalies, dural venous sinus ectasia, and cavernous malformations. The prevalence of developmental venous anomalies in this patient population was compared with an age- and sex-matched control group without venous malformations at a ratio of 1:2. Categoric variables were compared with χ2 tests. RESULTS Sixty-three patients with venous malformations met the inclusion criteria with a mean age of 38.3 ± 24.0 years. The overall presence of developmental venous anomalies in patients with venous malformations was 36.5% (23/63) compared with 7.9% (10/126) in controls (P < .001). The prevalence of dural venous sinus ectasia was 9.5% (6/63) compared with 0% for controls (P = .002). One patient with a venous malformation had a cavernous malformation compared with 1 patient in the control group (P = .62). In 73.9% of patients (17/23), developmental venous anomalies were along the same metamere; and in 82.6% of patients, developmental venous anomalies were ipsilateral to the venous malformations. CONCLUSIONS Our case-control study demonstrated a significant association between cervicofacial venous malformations and cerebral developmental venous anomalies as well as between cervicofacial venous malformations and dural venous sinus abnormalities. Our findings suggest that venous malformations may be the result of a segmental in utero insult to cells involved in cerebrofacial venous development.
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Affiliation(s)
- W Brinjikji
- From the Departments of Radiology (W.B., I.T.M., V.M.S., J.B.G.) .,Neurosurgery (W.B.), Mayo Clinic, Rochester, Minnesota
| | - I T Mark
- From the Departments of Radiology (W.B., I.T.M., V.M.S., J.B.G.)
| | - V M Silvera
- From the Departments of Radiology (W.B., I.T.M., V.M.S., J.B.G.)
| | - J B Guerin
- From the Departments of Radiology (W.B., I.T.M., V.M.S., J.B.G.)
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Lv X, Jiang C, Wang J. Pediatric intracranial arteriovenous shunts: Advances in diagnosis and treatment. Eur J Paediatr Neurol 2020; 25:29-39. [PMID: 31996298 DOI: 10.1016/j.ejpn.2019.12.025] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Revised: 11/24/2019] [Accepted: 12/29/2019] [Indexed: 02/07/2023]
Abstract
Pediatric intracranial arteriovenous shunts (IAVSs) comprise a wide range of lesions, including pial arteriovenous malformation (AVM) and arteriovenous fistula (AVF), dural arteriovenous fistula (DAVF) and vein of Galen aneurysmal malformation (VGAM). We provide an overview of pediatric IAVSs, encompassing both diagnosis and endovascular treatment. We include references from pertinent literature and representative cases from our hospital. Pediatric IAVS are frequently associated two broader conditions, such as capillary malformation-arteriovenous malformation (CM-AVM) and hereditary hemorrhagic telangiectasia (HHT). These conditions and the associated genetic mutations have only recently been described. Their impact on the brain will be different in the prenatal period, in neonates, in infants, and in children, with variable symptoms according to each age group and the current strategies of endovascular treatment in the management of these vascular lesions will be discussed. This review could improve the understanding of pediatric IAVSs and their diagnosis and treatment.
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Affiliation(s)
- Xianli Lv
- Neurosurgery Department, Beijing Tsinghua Changgung Hospital, School of Clinical Medicine, Tsinghua University, Beijing, China.
| | - Chuhan Jiang
- Neurosurgery Department, Beijing Tsinghua Changgung Hospital, School of Clinical Medicine, Tsinghua University, Beijing, China
| | - James Wang
- Neurosurgery Department, Beijing Tsinghua Changgung Hospital, School of Clinical Medicine, Tsinghua University, Beijing, China
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Brinjikji W, Nicholson P, Hilditch CA, Krings T, Pereira V, Agid R. Cerebrofacial venous metameric syndrome-spectrum of imaging findings. Neuroradiology 2020; 62:417-425. [PMID: 31932853 DOI: 10.1007/s00234-020-02362-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Accepted: 01/02/2020] [Indexed: 02/07/2023]
Abstract
Cerebrofacial venous metameric syndrome (CVMS) is a complex craniofacial vascular malformation disorder in which patients have a constellation of venous vascular malformations affecting soft tissues, bone, dura, and neural structures including the eye and brain. It is hypothesized that a somatic mutation responsible for the venous abnormalities occurred prior to migration of the neural crest cells, and because of this, facial, osseous, and cerebral involvement typically follows a segmental or "metameric" distribution. The most commonly recognized form of CVMS is Sturge-Weber syndrome. However, a wide spectrum of CVMS phenotypical presentations exist with various metameric distributions of slow-flow vascular lesions including facial venous vascular malformations, developmental venous anomalies, venous angiomas, cavernous malformations (cavernomas), dural sinus malformations, and maybe even vascular tumors such as cavernous hemangiomas. Awareness of the various manifestations as described herewith is important for treatment and screening purposes.
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Affiliation(s)
- Waleed Brinjikji
- Division of Neuroradiology, Joint Department of Medical Imaging, Toronto Western Hospital, UHN, University of Toronto, Toronto, Ontario, Canada.
- Mayo Clinic, 200 1st Street SW, Rochester, MN, 55905, USA.
| | - Patrick Nicholson
- Division of Neuroradiology, Joint Department of Medical Imaging, Toronto Western Hospital, UHN, University of Toronto, Toronto, Ontario, Canada
| | - Christopher A Hilditch
- Division of Neuroradiology, Joint Department of Medical Imaging, Toronto Western Hospital, UHN, University of Toronto, Toronto, Ontario, Canada
| | - Timo Krings
- Division of Neuroradiology, Joint Department of Medical Imaging, Toronto Western Hospital, UHN, University of Toronto, Toronto, Ontario, Canada
| | - Vitor Pereira
- Division of Neuroradiology, Joint Department of Medical Imaging, Toronto Western Hospital, UHN, University of Toronto, Toronto, Ontario, Canada
| | - Ronit Agid
- Division of Neuroradiology, Joint Department of Medical Imaging, Toronto Western Hospital, UHN, University of Toronto, Toronto, Ontario, Canada
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Kamboj A, Tooley AA, Godfrey KJ, Maher MD, Schubert HD, Kazim M. Extraocular muscle enlargement in retinoencephalofacial angiomatosis. Orbit 2019; 39:221-223. [PMID: 31658870 DOI: 10.1080/01676830.2019.1677727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
A 22-year-old female presented for evaluation of five years of progressive left exophthalmos and intermittent blurred vision. She had previously received laser treatment for peripheral retinal neovascularization and had undergone lip reconstruction for a left-sided congenital vascular facial malformation. Magnetic resonance imaging demonstrated diffuse enlargement of the left extraocular and temporalis muscles, with prominent vessels in the temporalis muscle and intraconal fat. Left fundoscopic examination revealed grossly enlarged, tortuous retinal vessels extending from the optic disc to the peripheral retina and an abnormal network of capillaries. On the basis of these findings, a diagnosis of retinoencephalofacial angiomatosis was established. Retinoencephalofacial angiomatosis is a rare, non-hereditary disorder associated with ipsilateral retinal, brain, and facial arteriovenous malformations. This is the first report, to the authors' knowledge, of retinoencephalofacial angiomatosis presenting with exophthalmos secondary to extraocular muscle enlargement.
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Affiliation(s)
- Alisha Kamboj
- Department of Ophthalmology, Edward S. Harkness Eye Institute, Columbia University Medical Center, New York, NY, USA
| | - Andrea A Tooley
- Department of Ophthalmology, Edward S. Harkness Eye Institute, Columbia University Medical Center, New York, NY, USA
| | - Kyle J Godfrey
- Department of Ophthalmology, Edward S. Harkness Eye Institute, Columbia University Medical Center, New York, NY, USA
| | - Mary D Maher
- Department of Radiology, Columbia University Medical Center, New York, NY, USA
| | - Hermann D Schubert
- Department of Ophthalmology, Edward S. Harkness Eye Institute, Columbia University Medical Center, New York, NY, USA
| | - Michael Kazim
- Department of Ophthalmology, Edward S. Harkness Eye Institute, Columbia University Medical Center, New York, NY, USA
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Lenck S, Nicholson P, Tymianski R, Hilditch C, Nouet A, Patel K, Krings T, Tymianski M, Radovanovic I, Mendes Pereira V. Spinal and Paraspinal Arteriovenous Lesions. Stroke 2019; 50:2259-2269. [DOI: 10.1161/strokeaha.118.012783] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Stéphanie Lenck
- From the Division of Neuroradiology, Department of Medical Imaging, Toronto Western Hospital, University Health Network and University of Toronto (S.L., P.N., C.H., T.K., V.M.P.), University Health Network, ON, Canada
- Division of Neuroradiology (S.L.), Groupe Hospitalier Pitié-Salpêtrière, Paris Sorbonne University, France
| | - Patrick Nicholson
- From the Division of Neuroradiology, Department of Medical Imaging, Toronto Western Hospital, University Health Network and University of Toronto (S.L., P.N., C.H., T.K., V.M.P.), University Health Network, ON, Canada
| | - Rachel Tymianski
- Adelaide Medical School, University of Adelaide, Australia (R.T.)
| | - Christopher Hilditch
- From the Division of Neuroradiology, Department of Medical Imaging, Toronto Western Hospital, University Health Network and University of Toronto (S.L., P.N., C.H., T.K., V.M.P.), University Health Network, ON, Canada
| | - Aurélien Nouet
- Division of Neurosurgery (A.N.), Groupe Hospitalier Pitié-Salpêtrière, Paris Sorbonne University, France
| | - Krunal Patel
- Division of Neurosurgery, Department of Surgery, Toronto Western Hospital, University Health Network, University of Toronto, ON, Canada (K.P., M.T., I.R., V.M.P.)
| | - Timo Krings
- From the Division of Neuroradiology, Department of Medical Imaging, Toronto Western Hospital, University Health Network and University of Toronto (S.L., P.N., C.H., T.K., V.M.P.), University Health Network, ON, Canada
| | - Michael Tymianski
- Krembil Neuroscience Center (M.T., I.R.), University Health Network, ON, Canada
- Division of Neurosurgery, Department of Surgery, Toronto Western Hospital, University Health Network, University of Toronto, ON, Canada (K.P., M.T., I.R., V.M.P.)
| | - Ivan Radovanovic
- Krembil Neuroscience Center (M.T., I.R.), University Health Network, ON, Canada
- Division of Neurosurgery, Department of Surgery, Toronto Western Hospital, University Health Network, University of Toronto, ON, Canada (K.P., M.T., I.R., V.M.P.)
| | - Vitor Mendes Pereira
- From the Division of Neuroradiology, Department of Medical Imaging, Toronto Western Hospital, University Health Network and University of Toronto (S.L., P.N., C.H., T.K., V.M.P.), University Health Network, ON, Canada
- Division of Neurosurgery, Department of Surgery, Toronto Western Hospital, University Health Network, University of Toronto, ON, Canada (K.P., M.T., I.R., V.M.P.)
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Drake B, Patro S, Quateen A, Cora EA, Finitsis S, Sinclair J, Lesiuk H, Iancu D. Metameric spinal AVM: Long-term symptomatic relief achieved by embolization of the extradural component. Interv Neuroradiol 2019; 25:469-473. [PMID: 30922201 DOI: 10.1177/1591019919828135] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Metameric spinal cord arteriovenous malformations (AVMs) are rare lesions characterized by an intradural and extradural component. They are difficult to treat surgically by the endovascular route. We report a case in which symptomatic relief was achieved by embolization of the extradural component only. CASE PRESENTATION A 35-year-old woman presented with acute worsening of back pain, weakness in the left leg and urinary retention. Spinal angiography showed a metameric spinal cord AVM with partial common venous drainage of the extradural and intradural components. CONCLUSIONS Targeted embolization of the extradural component led to dramatic improvement of the patient's symptoms, probably by achieving venous decongestion. She remains neurologically stable at two years' follow-up.
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Affiliation(s)
- B Drake
- 1 University of Ottawa, Ottawa, Canada
| | - S Patro
- 2 Hamad General Hospital, Neuroscience Al Sadd, Doha, Qatar
| | - A Quateen
- 1 University of Ottawa, Ottawa, Canada
| | - E A Cora
- 1 University of Ottawa, Ottawa, Canada
| | - S Finitsis
- 3 Aristotle University of Thessaloniki, Thessaloníki, Greece
| | | | - H Lesiuk
- 1 University of Ottawa, Ottawa, Canada
| | - D Iancu
- 1 University of Ottawa, Ottawa, Canada
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Ferraz A, Morais S, Mimoso G. Role of the cerebral ultrasound in a case of Sturge-Weber syndrome. BMJ Case Rep 2019; 12:12/4/e227834. [PMID: 30962208 DOI: 10.1136/bcr-2018-227834] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Cerebral ultrasound (CUS) can be a valuable non-invasive diagnostic tool for brain involvement in Sturge-Weber syndrome (SWS). Literature discussing the relevance of ultrasound in SWS is, however, scarce.We report a case of a newborn with SWS and serious brain abnormalities diagnosed on the first day of life with a CUS.
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Affiliation(s)
- Ana Ferraz
- Pediatric Department, Hospital Pediátrico, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal
| | - Sofia Morais
- Neonatologia B, Maternidade Bissaya Barreto, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal
| | - Gabriela Mimoso
- Neonatologia B, Maternidade Bissaya Barreto, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal
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Barros FS, Marussi VHR, Amaral LLF, da Rocha AJ, Campos CMS, Freitas LF, Huisman TAGM, Soares BP. The Rare Neurocutaneous Disorders: Update on Clinical, Molecular, and Neuroimaging Features. Top Magn Reson Imaging 2018; 27:433-462. [PMID: 30516694 DOI: 10.1097/rmr.0000000000000185] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Phakomatoses, also known as neurocutaneous disorders, comprise a vast number of entities that predominantly affect structures originated from the ectoderm such as the central nervous system and the skin, but also the mesoderm, particularly the vascular system. Extensive literature exists about the most common phakomatoses, namely neurofibromatosis, tuberous sclerosis, von Hippel-Lindau and Sturge-Weber syndrome. However, recent developments in the understanding of the molecular underpinnings of less common phakomatoses have sparked interest in these disorders. In this article, we review the clinical features, current pathogenesis, and modern neuroimaging findings of melanophakomatoses, vascular phakomatoses, and other rare neurocutaneous syndromes that may also include tissue overgrowth or neoplastic predisposition.
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Affiliation(s)
- Felipe S Barros
- Division of Neuroradiology, BP Medicina Diagnóstica, Hospital da Beneficência Portuguesa de São Paulo
| | - Victor Hugo R Marussi
- Division of Neuroradiology, BP Medicina Diagnóstica, Hospital da Beneficência Portuguesa de São Paulo
| | - Lázaro L F Amaral
- Division of Neuroradiology, BP Medicina Diagnóstica, Hospital da Beneficência Portuguesa de São Paulo
| | - Antônio José da Rocha
- Division of Neuroradiology, Department of Radiology, Santa Casa de São Paulo School of Medical Sciences, São Paulo, Brazil
| | - Christiane M S Campos
- Division of Neuroradiology, BP Medicina Diagnóstica, Hospital da Beneficência Portuguesa de São Paulo
| | - Leonardo F Freitas
- Division of Neuroradiology, BP Medicina Diagnóstica, Hospital da Beneficência Portuguesa de São Paulo
| | - Thierry A G M Huisman
- Division of Pediatric Radiology and Pediatric Neuroradiology, Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Bruno P Soares
- Division of Pediatric Radiology and Pediatric Neuroradiology, Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD
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Brinjikji W, Hilditch CA, Tsang AC, Nicholson PJ, Krings T, Agid R. Facial Venous Malformations Are Associated with Cerebral Developmental Venous Anomalies. AJNR Am J Neuroradiol 2018; 39:2103-2107. [PMID: 30237297 DOI: 10.3174/ajnr.a5811] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2018] [Accepted: 08/06/2018] [Indexed: 01/18/2023]
Abstract
BACKGROUND AND PURPOSE A number of studies have demonstrated the existence of segmental vascular disorders affecting soft tissues of the head and neck along with the intracranial vasculature. The purpose of this study was to determine whether there is an association between cerebral developmental venous anomalies and venous malformations of the face, head, and neck. MATERIALS AND METHODS A consecutive series of patients with head and neck venous malformations who underwent MR imaging of the brain with postcontrast T1- or T2*-weighted imaging were included. Developmental venous anomaly prevalence in this patient population was compared with an age- and sex-matched control group without venous malformations at a ratio of 1:2. All images were interpreted by 2 neuroradiologists. Data were collected on venous malformation location, developmental venous anomaly location, developmental venous anomaly drainage pattern, and metameric location of venous malformations and developmental venous anomalies. Categoric variables were compared using χ2 tests. RESULTS Forty-two patients with venous malformations were included. The mean age was 38.1 ± 11.1 years, and 78.6% of patients were female. The prevalence of developmental venous anomalies in this patient population was 28.6%. The control population of 84 patients had a mean age of 40.0 ± 5.9 years, and 78.6% of patients were female. The prevalence of developmental venous anomalies in this patient population was 9.5% (P = .01). In 83.3% of cases, developmental venous anomalies were ipsilateral to the venous malformation, and in 75% of cases, they involved the same metamere. CONCLUSIONS Our case-control study demonstrated a significant association between brain developmental venous anomalies and superficial venous malformations. These findings suggest that there may be a similar pathophysiologic origin for these 2 entities.
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Affiliation(s)
- W Brinjikji
- From the Departments of Radiology (W.B.)
- Neurosurgery (W.B.), Mayo Clinic, Rochester, Minnesota
- Joint Department of Medical Imaging (W.B., C.A.H., A.C.T., P.J.N., T.K., R.A.), Toronto Western Hospital, Toronto, Ontario, Canada
| | - C A Hilditch
- Joint Department of Medical Imaging (W.B., C.A.H., A.C.T., P.J.N., T.K., R.A.), Toronto Western Hospital, Toronto, Ontario, Canada
| | - A C Tsang
- Joint Department of Medical Imaging (W.B., C.A.H., A.C.T., P.J.N., T.K., R.A.), Toronto Western Hospital, Toronto, Ontario, Canada
| | - P J Nicholson
- Joint Department of Medical Imaging (W.B., C.A.H., A.C.T., P.J.N., T.K., R.A.), Toronto Western Hospital, Toronto, Ontario, Canada
| | - T Krings
- Joint Department of Medical Imaging (W.B., C.A.H., A.C.T., P.J.N., T.K., R.A.), Toronto Western Hospital, Toronto, Ontario, Canada
| | - R Agid
- Joint Department of Medical Imaging (W.B., C.A.H., A.C.T., P.J.N., T.K., R.A.), Toronto Western Hospital, Toronto, Ontario, Canada
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Goyal P, Mangla R, Gupta S, Malhotra A, Almast J, Sapire J, Kolar B. Pediatric Congenital Cerebrovascular Anomalies. J Neuroimaging 2018; 29:165-181. [DOI: 10.1111/jon.12575] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Revised: 10/11/2018] [Accepted: 10/13/2018] [Indexed: 11/29/2022] Open
Affiliation(s)
- Pradeep Goyal
- Department of Radiology; St. Vincent's Medical Center; Bridgeport CT
| | - Rajiv Mangla
- Department of Radiology; SUNY Upstate Medical University; Syracuse NY
| | - Sonali Gupta
- Department of Medicine; St. Vincent's Medical Center; Bridgeport CT
| | - Ajay Malhotra
- Department of Radiology and Biomedical Imaging; Yale School of Medicine; New Haven CT
| | - Jeevak Almast
- Department of Radiology; University of Rochester Medical Center; Rochester NY
| | - Joshua Sapire
- Department of Radiology; St. Vincent's Medical Center; Bridgeport CT
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Capuano V, Oliverio L, Amoroso F, Srour M, Souied EH, Querques G. Appearance of macular edema during pregnancy due to retinal arteriovenous malformation. J Fr Ophtalmol 2018; 41:e383-e385. [PMID: 30172380 DOI: 10.1016/j.jfo.2017.11.038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Accepted: 11/16/2017] [Indexed: 11/25/2022]
Affiliation(s)
- V Capuano
- Department of ophthalmology, centre hospitalier intercommunal de Créteil University Paris Est, 40, avenue de Verdun, 94000 Créteil, France
| | - L Oliverio
- Department of ophthalmology, centre hospitalier intercommunal de Créteil University Paris Est, 40, avenue de Verdun, 94000 Créteil, France
| | - F Amoroso
- Department of ophthalmology, centre hospitalier intercommunal de Créteil University Paris Est, 40, avenue de Verdun, 94000 Créteil, France
| | - M Srour
- Department of ophthalmology, centre hospitalier intercommunal de Créteil University Paris Est, 40, avenue de Verdun, 94000 Créteil, France
| | - E H Souied
- Department of ophthalmology, centre hospitalier intercommunal de Créteil University Paris Est, 40, avenue de Verdun, 94000 Créteil, France
| | - G Querques
- Department of ophthalmology, centre hospitalier intercommunal de Créteil University Paris Est, 40, avenue de Verdun, 94000 Créteil, France; Department of ophthalmology, IRCCS Ospedale San Raffaele, university Vita-Salute, Milan, Italy.
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Fernández-Gajardo R, Almeida JP, Suppiah S, Witterick I, Zadeh G. Ethmoid Meningoencephalocele in a Patient with Cerebrofacial Arteriovenous Metameric Syndrome. World Neurosurg 2018; 114:1-3. [DOI: 10.1016/j.wneu.2018.02.133] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Revised: 02/20/2018] [Accepted: 02/22/2018] [Indexed: 12/12/2022]
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Ng JC, Appuhamy C, Lee W. Cerebrofacial arteriovenous metameric syndrome with hypopituitarism: a rare association. BMJ Case Rep 2018; 2018:bcr-2017-222708. [PMID: 29330274 PMCID: PMC5780589 DOI: 10.1136/bcr-2017-222708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Case of cerebrofacial arteriovenous metameric syndrome (CAMS) in a 9-year-old boy is described with arteriovenous malformation simultaneously involving the brain and face, with characteristic CAMS type 1 and 2 involvement. This patient demonstrates the wide spectrum of clinical manifestations of CAMS, and in this particular case, the patient exhibits features of hypopituitarism—an association that was not previously described in the literature to our knowledge. Awareness of the underlying embryological abnormality and recognition of resultant clinical and radiological presentations are paramount for diagnosis and treatment.
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Affiliation(s)
| | - Chinthaka Appuhamy
- Department of Neuroradiology, National Neuroscience Institute, Singapore
| | - Wickly Lee
- Department of Neuroradiology, National Neuroscience Institute, Singapore
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Ishikawa H, Ii Y, Niwa A, Matsuura K, Maeda M, Tomimoto H. A case of 55-year-old man with first-ever generalized seizure diagnosed with Sturge-Weber syndrome type III by characteristic MRI findings. Rinsho Shinkeigaku 2017; 57:214-219. [PMID: 28450688 DOI: 10.5692/clinicalneurol.cn-001006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
A 55-year-old man with no mental retardation had presented a history of frequent transient clumsiness of his right upper and lower extremities for about 20 years. He was admitted to a general hospital with weakness of right side of the body, and first-ever generalized seizure attack occurred the next day. Brain CT showed calcification in the left cerebral cortices. So he was referred to our hospital. On neurological examination, he had mild clumsiness of his right upper limb and right pyramidal tract sign. He had neither facial port-wine stain nor glaucoma. The blood test and cerebrospinal fluid analysis were unremarkable. Electroencephalogram showed slowing and reduction of activity at the left frontal and parietal areas with no epileptic activities. Brain CT showed "tram-track calcification" and lobar atrophy in the left fronto-parietal cortices. Susceptibility weighted imaging (SWI) on MRI revealed enlarged transmedullary veins in the left periventricular white matter and low intensity lesions along the cortical gyri. Post gadolinium fluid-attenuated inversion recovery imaging (FLAIR-Gd) showed leptomeningeal enhancement in the left fronto-parietal lobes more extensively than those by post gadolinium T1-weighted image. Brain perfusion single photon emission computed tomography with a technetium-99m-ethyl cysteinate dimer (99mTc-ECD SPECT) revealed hypoperfusion in the fronto-parietal lobes. These clinical and neuroimaging findings were compatible with type III Sturge-Weber syndrome (SWS). His condition was improved after treatment with oral levetiracetam (1,000 mg daily). Although adult-onset type III SWS is very rare, it is important to perform SWI and post-contrast FLAIR for assessing leptomeningeal angioma in patients with seizure with focal cortical calcification even if they have no facial nevus.
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Affiliation(s)
| | - Yuichiro Ii
- Department of Neurology, Mie University Graduate School of Medicine
| | - Atsushi Niwa
- Department of Neurology, Mie University Graduate School of Medicine
| | - Keita Matsuura
- Department of Neurology, Mie University Graduate School of Medicine
| | - Masayuki Maeda
- Department of Advanced Diagnostic Imaging, Mie University Graduate School of Medicine
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Niimi Y. Endovascular treatment of pediatric intracranial arteriovenous shunt. Pediatr Int 2017; 59:247-257. [PMID: 27601322 DOI: 10.1111/ped.13159] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Revised: 07/25/2016] [Accepted: 07/29/2016] [Indexed: 11/28/2022]
Abstract
Intracranial arteriovenous shunts (ICAVS) in young children are characterized by frequent high-flow fistulas. In association with high-flow fistulas and the physiological condition of the developing brain and heart, each ICAVS type tends to present at a certain age with unique symptoms. Vein of Galen aneurysmal malformation (VGAM) and dural sinus malformation with arteriovenous (AV) shunt tend to present in the neonate with high output cardiac failure. In infancy, VGAM, pial arteriovenous fistula (AVF) and infantile dural AVF (DAVF) tend to present with hydrodynamic disorder such as macrocephaly, ventriculomegaly, prominent facial veins, and developmental delay. Pial AVF, AV malformation, and infantile DAVF can present with focal neurological signs such as seizure or hemorrhage at older ages. Endovascular treatment is currently the first choice of treatment for most pediatric ICAVS. The treatment goal should be defined on a patient-by-patient basis, according to the unique physiological condition of the child.
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Affiliation(s)
- Yasunari Niimi
- Department of Neuroendovascular Therapy, St Luke's International Hospital, Tokyo, Japan
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Cerebrofacial arteriovenous metameric syndrome (CAMS): a spectrum disorder of craniofacial vascular malformations. Childs Nerv Syst 2017; 33:513-516. [PMID: 27787648 DOI: 10.1007/s00381-016-3277-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Accepted: 10/07/2016] [Indexed: 10/20/2022]
Abstract
Cerebrofacial arteriovenous metameric syndrome (CAMS) is a recent classification of vascular malformations that encompasses a spectrum of phenotypic expression involving arteriovenous malformations (AVMs) of the cerebral, orbital, and facial region. Recognizing the embryologic basis of CAMS is important for diagnosing other AVMs along the same metameric level. Visual loss is the most common presentation prompting ophthalmologic evaluation followed by neuroimaging. We present two pediatric patients with ipsilateral optic nerve and chiasmal AVMs without cutaneous manifestations, characteristic of CAMS 2. The diagnosis of cerebral AVMs was made by magnetic resonance imaging of the brain and confirmed with cerebral angiography. High-resolution flat-panel computed tomography was performed in one patient and was useful to demonstrate the intraneural invasion of the optic nerve by the AVM.
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Capuano V, Miere A, Amoroso F, Todisco L, Cohen SY, Souied E, Querques G. Uncommon retinal vascular diseases. EXPERT REVIEW OF OPHTHALMOLOGY 2016. [DOI: 10.1080/17469899.2016.1251315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Dmytriw AA, Song JSA, Power S, Saliou G, terBrugge K. Management of a large diffuse maxillofacial arteriovenous malformation previously treated with ligation of ipsilateral arterial supply. Dentomaxillofac Radiol 2016; 46:20160130. [PMID: 27540624 DOI: 10.1259/dmfr.20160130] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
A 32 year-old male presented with a pulsatile facial mass with palpable thrill and audible bruit. Imaging revealed a very large diffuse left-sided facial arteriovenous malformation with extensive bilateral supply, as well as a previously ligated left external carotid artery. Endovascular treatment was required to control associated hemorrhagic events as well as for palliation and was delivered via the contralateral and ipsilateral collateral supply because of ligation of the direct route to the nidus. In addition, the patient received intravenous bevacizumab and intraarterial bleomycin therapy. Under such circumstances, endovascular embolization remains often the only option when emergent therapy for massive haemorrhage is required. Collaboration and treatment planning with head and neck surgery is imperative and should be performed from the onset, avoiding disastrous ligation of arterial feeders.
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Affiliation(s)
- Adam A Dmytriw
- 1 Department of Medical Imaging, University of Toronto, Toronto, ON, Canada
| | - Jin S A Song
- 2 Department of Otolaryngology-Head and Neck Surgery, University of Toronto, Toronto, ON, Canada
| | - Sarah Power
- 3 Division of Neuroradiology, Department of Medical Imaging, Toronto Western Hospital, Toronto, ON, Canada
| | - Guillaume Saliou
- 3 Division of Neuroradiology, Department of Medical Imaging, Toronto Western Hospital, Toronto, ON, Canada
| | - Karel terBrugge
- 3 Division of Neuroradiology, Department of Medical Imaging, Toronto Western Hospital, Toronto, ON, Canada
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Koch MJ, Agarwalla PK, Stapleton CJ, Ogilvy CS, Loeffler JS. De novo development of a cerebral arteriovenous malformation following radiation therapy: Case report and an update to classical arteriovenous malformation nomenclature. J Clin Neurosci 2016; 28:162-7. [DOI: 10.1016/j.jocn.2015.11.021] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Accepted: 11/29/2015] [Indexed: 12/27/2022]
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Endo T, Endo H, Sato K, Matsumoto Y, Tominaga T. Surgical and Endovascular Treatment for Spinal Arteriovenous Malformations. Neurol Med Chir (Tokyo) 2016; 56:457-64. [PMID: 26948701 PMCID: PMC4987445 DOI: 10.2176/nmc.ra.2015-0327] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Spinal arteriovenous malformation (AVM) is a broad term that constitutes diverse vascular pathologies. To date, various classification schemes for spinal AVM have been proposed in literature, which helped neurosurgeons understand the pathophysiology of the disease and determine an optimal treatment strategy. To discuss indications and results of surgical and endovascular interventions for spinal AVM, this article refers to the following classification proposed by Anson and Spetzler in 1992: type I, dural arteriovenous fistula (AVF); type II, glomus intramedullary AVM; type III, juvenile malformations; and type IV, perimedullary AVF. In general, complete obliteration of the fistula is a key for better outcome in type I dural and type IV perimedullary AVFs. On the other hand, in type II glomus and type III juvenile malformations, functional preservation, instead of pursuing angiographical cure, is the main goal of the treatment. In such cases, reduction of the shunt flow can alleviate clinical symptoms. Proper management of spinal AVM should start with neurological examination and understanding of angioarchitectures, which provide critical information that guides the indication and modality of intervention. Finally, close collaboration of the microsurgical and endovascular teams are mandatory for successful treatment.
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Affiliation(s)
- Toshiki Endo
- Department of Neurosurgery, Tohoku University, Graduate School of Medicine
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