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Xu N, Jiang C, Chen Z, Feng Z, Jiang C, Cao Y. A patient with cervical ligamentum flavum haematoma: case report. Spinal Cord Ser Cases 2024; 10:65. [PMID: 39209808 PMCID: PMC11362265 DOI: 10.1038/s41394-024-00679-6] [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: 09/29/2023] [Revised: 07/08/2024] [Accepted: 08/22/2024] [Indexed: 09/04/2024] Open
Abstract
INTRODUCTION Ligamentum flavum haematoma (LFH) is an extremely rare entity, found mostly in the lumbar and thoracic ligamentum flavum and seldom in the cervical ligamentum flavum. Cervical LFH can cause paralysis in patients. We describe a case of LFH in the cervical spine that accepted surgical treatment. CASE PRESENTATION A 70-year-old man with incomplete spinal cord injury presented with sudden paralysis of his left limbs for 10 days and hemi-hypaesthesia below the level of the right clavicle. Magnetic resonance imaging (MRI) showed a space-occupying lesion in the left ligamentum flavum between the C4 and C5 laminae. The preliminary diagnoses were concluded to be incomplete spinal cord injury, spinal epidural lesions, and cervical spinal stenosis. After a posterior C3-C6 laminectomy with lateral mass screw instrumentation, the muscle strength and sensation recovered partially. The lesion was greyish black and located in the ligamentum flavum. A pathological examination identified it as a haematoma of the ligamentum flavum. The patient was discharged 15 days after the operation and commenced rehabilitation. DISCUSSION The LFH was mainly caused by slight trauma during gentle activities and contributed by many factors. MRI is an essential tool but pathological diagnosis is the gold standard. Most LFH patients can be treated surgically.
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Affiliation(s)
- Nixi Xu
- Department of Orthopedics, Zhongshan Hospital Fudan University, Shanghai, 200032, China
| | - Chang Jiang
- Department of Orthopedics, Zhongshan Hospital Fudan University, Shanghai, 200032, China
| | - Zixian Chen
- Department of Orthopedics, Zhongshan Hospital Fudan University, Shanghai, 200032, China
| | - Zhenzhou Feng
- Department of Orthopedics, Zhongshan Hospital Fudan University, Shanghai, 200032, China
| | - Chun Jiang
- Department of Orthopedics, Zhongshan Hospital Fudan University, Shanghai, 200032, China
| | - Yuanwu Cao
- Department of Orthopedics, Zhongshan Hospital Fudan University, Shanghai, 200032, China.
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Sahri IE, Tlemcani ZC, Abide Z, Obame FLO, Ramdani H, Mohammed M, Dokponou YCH, Elmi SM, Imbunhe N, Akroud SE, Cherif EA, Miloudi G. Ligamentum flavum hematoma in the lumbar spine mimicking spinal tumor: A case report and review of the literature. Radiol Case Rep 2023; 18:3060-3064. [PMID: 37434624 PMCID: PMC10331011 DOI: 10.1016/j.radcr.2023.05.073] [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: 05/25/2023] [Accepted: 05/29/2023] [Indexed: 07/13/2023] Open
Abstract
Liagmentum flavum hematoma (LFH) is a rare cause of radiculopathy and low back pain, sharing similar symptomatology with disc herniation. It predominantly affects the lumbar thoracic spine. The underlying mechanism of LFH remains unclear; however, surgical removal of the hematoma has consistently demonstrated excellent outcomes. The objective of this case report is to emphasize the significance of diagnosing LFH. We present a surgically confirmed lumbar LFH case that mimicked a lumbar tumor, highlighting the challenges encountered during diagnosis and subsequent management.
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Affiliation(s)
- Imad-eddine Sahri
- Department of Neurosurgery– Mohammed V Military Hospital-Rabat, Souissi St, 10100 Rabat, Morocco
| | - Zakaria Chandid Tlemcani
- Department of Neurosurgery– Mohammed V Military Hospital-Rabat, Souissi St, 10100 Rabat, Morocco
| | - Zakaria Abide
- Department of Radiology – Mohammed V Military Hospital-Rabat, Rabat, Morocco
| | | | - Hanae Ramdani
- Department of Radiology – Mohammed V Military Hospital-Rabat, Rabat, Morocco
| | - Mohssani Mohammed
- Department of Neurosurgery– Mohammed V Military Hospital-Rabat, Souissi St, 10100 Rabat, Morocco
| | | | - Saad Moussa Elmi
- Department of Neurosurgery– Mohammed V Military Hospital-Rabat, Souissi St, 10100 Rabat, Morocco
| | - Napoleão Imbunhe
- Department of Neurosurgery– Mohammed V Military Hospital-Rabat, Souissi St, 10100 Rabat, Morocco
| | - Sofia El Akroud
- Department of Neurosurgery– Mohammed V Military Hospital-Rabat, Souissi St, 10100 Rabat, Morocco
| | - ElAsri Abad Cherif
- Department of Neurosurgery– Mohammed V Military Hospital-Rabat, Souissi St, 10100 Rabat, Morocco
| | - Gazzaz Miloudi
- Department of Neurosurgery– Mohammed V Military Hospital-Rabat, Souissi St, 10100 Rabat, Morocco
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A Succession of MRI Scans Supports the Diagnosis of Lumbar Ligamentum Flavum Hematoma: A Case Report and Review of the Literature. Case Rep Orthop 2019; 2018:2860621. [PMID: 30598850 PMCID: PMC6288563 DOI: 10.1155/2018/2860621] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Accepted: 11/18/2018] [Indexed: 11/21/2022] Open
Abstract
Ligamentum flavum hematoma (LFH) is a rare cause of spinal nerve compression. This condition remains challenging to diagnose using MRI due to the changing intensity of the hematoma on imaging. The aim of this study was to describe the patient with LFH who had a succession of MRI scans carried out. We report on a 71-year-old woman with a mass at L4/5 and decompression surgery was performed for her left leg symptom. She had MRI carried out in a previous hospital and also had MRI again in our hospital. In a 2nd MRI of the same area, after a 2-week interval, a newly isointense mass was present within the anterior part of the previously identified lesion on T1-weighted image and the hyperintense area in the lesion was a little extended on T2-weighted imaging. Her symptoms were resolved immediately after decompression surgery. Following a review of previous cases, we suggest that consecutive MRI scanning may support the diagnostic process for LFH.
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Ozdemir B, Kanat A, Batcik OE, Gucer H, Yolas C. Ligamentum flavum hematomas: Why does it mostly occur in old Asian males? Interesting point of reported cases: Review and case report. JOURNAL OF CRANIOVERTEBRAL JUNCTION AND SPINE 2016; 7:7-12. [PMID: 27041879 PMCID: PMC4790154 DOI: 10.4103/0974-8237.176605] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Hematoma of the ligamentum flavum (LF) is a rare cause of neural compression and sciatica. Currently, the etiology and epidemiological characteristics of ligamentum flavum hematoma (LFH) are unknown and epidemiological investigations using rewieving of reported cases have not been performed. We report the case of a 63-year-old man with a LFH compressing the spinal canal at the left L2-L3 level, rewieved relevant literature. In Medline research, wefound a total of 50 reported cases with LFHs, and the interesting point of these cases were analyzed. Many of cases were old males. Interestingly, 39 of the 50 cases were reported from Asian countries. The ages of 42 patients could be verified. The youngest age was 45 years, oldest age was 81 years, and mean age was 66.07 years. Thirty-three out of these 42 patients (78.53%) were older than 60 years. An important aspect of the present review is to bring attention for occurrence in older Asian males. With an increasing number of elderly people in the general population, there is a need to investigate risk factors such as sexual gender, age, and geographic location for LFH.
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Affiliation(s)
- Bulent Ozdemir
- Department of Neurosurgery, Recep Tayyip Erdogan University, Medical Faculty, Rize, Turkey
| | - Ayhan Kanat
- Department of Neurosurgery, Recep Tayyip Erdogan University, Medical Faculty, Rize, Turkey
| | - Osman Ersegun Batcik
- Department of Neurosurgery, Recep Tayyip Erdogan University, Medical Faculty, Rize, Turkey
| | - Hasan Gucer
- Department of Pathology, Recep Tayyip Erdogan University, Medical Faculty, Rize, Turkey
| | - Coskun Yolas
- Neurosurgery Clinic, Erzurum Training and Research Hospital, Erzurum, Turkey
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Ligamentum flavum hematoma due to stretching exercise. Am J Emerg Med 2016; 34:2058.e3-2058.e6. [PMID: 27061499 DOI: 10.1016/j.ajem.2016.03.042] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2016] [Accepted: 03/15/2016] [Indexed: 01/11/2023] Open
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Algattas H, Kimmell KT, Petraglia AL, Maurer PK. Conservative management of a cervical ligamentum flavum hematoma: Case report. Surg Neurol Int 2016; 7:S61-3. [PMID: 26904367 PMCID: PMC4743262 DOI: 10.4103/2152-7806.174887] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Accepted: 10/07/2015] [Indexed: 11/04/2022] Open
Abstract
BACKGROUND Spontaneous epidural hematoma arising from the ligamentum flavum is a rare cause of acute spinal cord compression. There are only four reports in the cervical spine literature, and all were managed with surgery. Here, we describe an acute case of a spontaneous epidural hematoma arising from the ligamentum flavum in the cervical spine successfully managed without surgery. CASE DESCRIPTION A 69-year-old woman with a cervical spine epidural hematoma contained within the ligamentum flavum presented with paroxysmal neck pain and stiffness without a history of trauma. The magnetic resonance imaging (MRI) revealed a posterolateral epidural hematoma contained within the ligamentum flavum. As the patient was intact, she was managed conservatively with cervical orthosis. Three months later, she was symptom-free, and the hematoma resolved on the follow-up MRI study. CONCLUSION Spontaneous epidural hematoma arising from ligamentum flavum is a rare cause of spinal cord compression. Previous reports have described success with surgical decompression. However, initial observation and conservative management may be successful as illustrated in this case.
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Affiliation(s)
- Hanna Algattas
- Department of Neurosurgery, University of Rochester Medical Center, Rochester, New York, USA
| | - Kristopher T Kimmell
- Department of Neurosurgery, University of Rochester Medical Center, Rochester, New York, USA
| | - Anthony L Petraglia
- Department of Neurosurgery, Rochester Regional Health System, Rochester, New York, USA
| | - Paul K Maurer
- Department of Neurosurgery, Rochester Regional Health System, Rochester, New York, USA
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Haghnegahdar A, Sedighi M, Rahmanian A, Baghban F. Cervical Ligamentum Flavum Hematoma: A Case Report. Global Spine J 2016; 6:e30-4. [PMID: 26835213 PMCID: PMC4733368 DOI: 10.1055/s-0035-1550342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/15/2014] [Accepted: 03/03/2015] [Indexed: 11/09/2022] Open
Abstract
Study Design Case report. Objective To report the first case of ligamentum flavum hematoma after cervical spine instrumentation 11 years after the index surgery. Methods After performing bilateral C3 and C4 laminectomy, we observed a dark greenish discoloration over the ligamentum flavum, which was opened. We evacuated 15 mL of subacute hematoma. Results The first ligamentum flavum hematoma of the cervical spine that occurred after spinal instrumentation with sublaminar hooks. Conclusion Ligamentum flavum hematoma might happen even after a long delay (in our case, 11 years) from spinal instrumentation (sublaminar hooks). In symptomatic patients, evacuation is the treatment of choice. In cases of instrument adhesion to the surrounding intracanal tissues, removal should be done meticulously after performing a complete release.
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Affiliation(s)
- Ali Haghnegahdar
- Trauma Research Center, Shiraz University of Medical Sciences (SUMS), Shiraz, Iran,Department of Neurosurgery, Neurospine Section, Chamran Hospital, Shiraz University of Medical Sciences (SUMS), Shiraz, Iran
| | - Mahsa Sedighi
- Trauma Research Center, Shiraz University of Medical Sciences (SUMS), Shiraz, Iran,Department of Neurosurgery, Neurospine Section, Chamran Hospital, Shiraz University of Medical Sciences (SUMS), Shiraz, Iran,Address for correspondence Mahsa Sedighi, MD Department of Neurosurgery, Neurospine SectionChamran Hospital, Shiraz University of Medical Sciences (SUMS), PO Box 71345-1536, ShirazIran
| | - Abdolkarim Rahmanian
- Trauma Research Center, Shiraz University of Medical Sciences (SUMS), Shiraz, Iran,Department of Neurosurgery, Neurospine Section, Chamran Hospital, Shiraz University of Medical Sciences (SUMS), Shiraz, Iran
| | - Fahim Baghban
- Trauma Research Center, Shiraz University of Medical Sciences (SUMS), Shiraz, Iran,Department of Neurosurgery, Neurospine Section, Chamran Hospital, Shiraz University of Medical Sciences (SUMS), Shiraz, Iran
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Ligamentum flavum hematomas of the cervical and thoracic spine. Clin Neurol Neurosurg 2013; 116:24-7. [PMID: 24300742 DOI: 10.1016/j.clineuro.2013.11.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Revised: 10/17/2013] [Accepted: 11/09/2013] [Indexed: 01/11/2023]
Abstract
OBJECTIVE To report extremely rare cases of ligamentum flavum hematomas in the cervical and thoracic spine. Only six cases of thoracic ligamentum flavum hematomas and three cases of cervical ligamentum flavum hematomas have been reported so far. METHODS Two patients presented with tetraparesis and one patient presented with radicular pain and paresthesias in the T3 dermatome. MRI was performed in two patients, which showed a posterior intraspinal mass, continuous with the ligamentum flavum. The mass was moderately hypointense on T2-weighted images and hyperintense on T1-weighted images with no contrast enhancement. The third patient underwent cervical myelography because of a cardiac pacemaker. The myelography showed an intraspinal posterior mass with compression of the dural sac at C3/C4. RESULTS All patients underwent a hemilaminectomy to resect the ligamentum flavum hematoma and recovered completely afterwords, and did not experience a recurrence during follow-up of at least 2 years. CONCLUSION This case series shows rare cases of ligamentum flavum hematomas in the cervical and thoracic spine. Surgery achieved complete recovery of the preoperative symptoms in all patients within days.
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Takahashi M, Satomi K, Hasegawa A, Hasegawa M, Taki N, Ichimura S. Ligamentum flavum hematoma in the lumbar spine. J Orthop Sci 2012; 17:308-12. [PMID: 21604046 DOI: 10.1007/s00776-011-0083-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2010] [Accepted: 03/09/2011] [Indexed: 11/28/2022]
Affiliation(s)
- Masahito Takahashi
- Department of Orthopaedic Surgery, Kyorin University, School of Medicine, 6-20-2 Shinkawa, Mitaka, Tokyo, 181-8611, Japan.
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Kotani Y, Sudo H, Abumi K, Ito M, Matsubara S, Minami A. Spinal cord compression by hematoma in the cervical ligamentum flavum: a case report. Spine J 2012; 12:e18-21. [PMID: 22521674 DOI: 10.1016/j.spinee.2012.03.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2011] [Accepted: 03/28/2012] [Indexed: 02/03/2023]
Abstract
BACKGROUND CONTEXT There have been some reports describing hematoma in the thoracic and lumbar ligamentum flavum, but there have been only three reports of hematoma in the cervical ligamentum flavum. PURPOSE We describe another case of the ligamentum flavum hematoma in the cervical spine with a different feature of occurrence that required surgical treatment. STUDY DESIGN Case report. PATIENT SAMPLE Patient with ligamentum flavum hematoma in the cervical spine. OUTCOME MEASURES Preoperative magnetic resonance imaging and pathologic finding from operative specimen confirmed the diagnosis. METHODS A 69-year-old man insidiously presented with pain in his left upper arm and difficulty in left shoulder abduction. Neurologic examination demonstrated a cervical myelopathy with diffuse muscle weakness of left upper extremity and sensory disturbance. Imaging studies revealed a mass of high intense on T1-weighted images and isointense on T2-weighted images posterior to the dura at C4 lower end level. The patient underwent C4-C5 hemilaminectomy and the removal of the mass. The mass existed within the ligamentum flavum and was connected toward the pedicle like the beads of a rosary. RESULTS Histopathologic examination of the surgical specimen showed that the hematoma was present within the ligamentum flavum and contained macrophages that had phagocytosed red blood cells and hemosiderin. After surgery, the patients' symptoms immediately improved, and no recurrence was observed at 2 years postoperatively. CONCLUSIONS We reported a very rare case of hematoma in the ligamentum flavum of the cervical spine that required surgery. Because the patient was without the history of trauma, it was suggested that the use of antiplatelet drugs was responsible for the occurrence of the disease.
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Affiliation(s)
- Yoshihisa Kotani
- Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine, Sapporo 060-8638, Japan.
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Sfreddo E, Guerra MTE. Ligamentum flavum hematoma: a case report and literature review. COLUNA/COLUMNA 2012. [DOI: 10.1590/s1808-18512012000100016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The aim is to present a rare case of ligamentum flavum hematoma in the lumbar region, discuss its physiopathology and treatment and review the literature. A woman aged 68 presented with neurogenic claudication due to degenerative lumbar spondylolisthesis that evolved into a sudden worsening with cauda equina syndrome. The magnetic resonance imagining (MRI) showed signs of degeneration of the lumbar spine, with a narrow spinal canal from L2 to S1, anterolisthesis L4 L5 and an expansive lesion hyperintense on T1-weighted and hypointense on T2-weighted images considered compatible with hematoma in the topography of the yellow ligament in L1-L2. The patient underwent laminectomy and lumbar fixation. Her evolution was good in the postoperative period and at 18 months of follow-up hse walked alone, despite the pain that is controlled with simple medications. Even though rare, it seems that ligamentum flavum hematoma has a relationship with the degeneration and rupture of small vessels associated with micro trauma to the spine. Its physiopathology is not well defined and treatment is similar to other spine compression processes.
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Tamura T, Sakai T, Sairyo K, Takao S, Kagawa S, Katoh S, Yasui N. Hematoma in the cervical ligamentum flavum. Report of a case and review of the literature. Skeletal Radiol 2010; 39:289-93. [PMID: 19876627 DOI: 10.1007/s00256-009-0805-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2009] [Revised: 08/28/2009] [Accepted: 09/13/2009] [Indexed: 02/02/2023]
Abstract
Hematoma of the cervical ligamentum flavum is very rare, and its pathogenesis is unknown. We describe a case of ligamentum flavum hematoma in the cervical spine causing severe myelopathy. Postoperative histological examination suggested it was the result of the rupture of a hemangioma or of an arteriovenous malformation in the ligamentum flavum. After removal of the lesion, the patient's condition immediately improved. Review of all three reported cases, including this one, showed that complete resection of the mass resulted in immediate relief of symptoms of incomplete paraplegia. The findings of magnetic resonance imaging (MRI) of the hematoma may vary with time, and they may show no characteristic intensity. However, MRI of this case revealed that the tissues surrounding the mass were enhanced with gadolinium diethylene triamine penta-acetic acid, and an area of homogeneous iso-intensity was clearly surrounded by a low-intensity area (flavum) on T2-weighed short-tau inversion recovery images. These findings could be characteristic of the ligamentum flavum hematoma and might help in the differentiation from a cervical epidural hematoma.
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Affiliation(s)
- Tatsuya Tamura
- Department of Orthopedics, Institute of Health Biosciences, The University of Tokushima Graduate School, 3-18-15 Kuramoto-cho, Tokushima, 770-8503, Japan
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Lee HW, Song JH, Chang IB, Choi HC. Spontaneous ligamentum flavum hematoma in the rigid thoracic spine : a case report and review of the literature. J Korean Neurosurg Soc 2008; 44:47-51. [PMID: 19096657 DOI: 10.3340/jkns.2008.44.1.47] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2008] [Accepted: 07/07/2008] [Indexed: 01/11/2023] Open
Abstract
Ligamentum flavum hematoma is a rare condition. Twenty cases including present case have been reported in English-language literature. Among them, only one case reported in pure thoracic spine. A 72-year-old man presented with thoracic myelopathy without precedent cause. Magnetic resonance images revealed a posterior semicircular mass which was located in T7 and T8 level compressing the spinal cord dorsally. T7-8 total laminectomy and extirpation of the mass was performed. One month later following surgery, the patient fully recovered to normal state. Pathologic result was confirmed as ligamentum flavum hematoma. Ligamentum flavum hematoma of rigid thoracic spine is a very rare disease entity. Most reported cases were confined to mobile cervical and lumbar spine. Surgeons should be aware that there seems to be another different pathogenesis other than previously reported cases of mobile cervical and lumbar spine.
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Affiliation(s)
- Hyun-Woo Lee
- Department of Neurosurgery, Sacred Heart Hospital, College of Medicine, Hallym University, Anyang, Korea
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MIYAKOSHI N, KASUKAWA Y, ANDO S, SHIMADA Y. Two-level Ligamentum Flavum Hematoma in the Lumbar Spine -Case Report-. Neurol Med Chir (Tokyo) 2008; 48:179-82. [DOI: 10.2176/nmc.48.179] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Naohisa MIYAKOSHI
- Division of Orthopedic Surgery, Department of Neuro and Locomotor Science, Akita University School of Medicine
| | - Yuji KASUKAWA
- Division of Orthopedic Surgery, Department of Neuro and Locomotor Science, Akita University School of Medicine
| | - Shigeru ANDO
- Division of Orthopedic Surgery, Department of Neuro and Locomotor Science, Akita University School of Medicine
| | - Yoichi SHIMADA
- Division of Orthopedic Surgery, Department of Neuro and Locomotor Science, Akita University School of Medicine
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