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Lapteva K, Gavrjushin A, Pitskhelauri D, Birg T, Danilov G, Ogurtsova A, Strunina Y, Fomochkina L. Intraoperative Neurophysiologic Monitoring in Predicting Dysphagia After Brainstem and Fourth Ventricle Surgery. World Neurosurg 2023; 180:e334-e340. [PMID: 37757944 DOI: 10.1016/j.wneu.2023.09.069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Accepted: 09/18/2023] [Indexed: 09/29/2023]
Abstract
OBJECTIVE Dysphagia represents the main complication of posterior fossa neurosurgery. Adequate diagnosis of this complication is warranted to prevent untimely extubation with subsequent aspiration. Intraoperative neurophysiologic monitoring (IONM) modalities may be used for this purpose. However, it is not known which IONM modality may be significant for diagnosis. This study aimed to define the most significant IONM modality for dysphagia prognostication after posterior fossa neurosurgery. METHODS The analysis included 46 patients (34 with tumors of the fourth ventricle and 12 with brainstem localization) who underwent surgical excision of the tumor. Neurologic symptoms before and after neurosurgery were noted and magnetic resonance imaging with the subsequent volume estimation of the removed mass was performed, followed by an IONM findings analysis (mapping of the nucleus of the caudal cranial nerves [CN] and corticobulbar motor-evoked potentials [CoMEP]). RESULTS Aggravation of dysphagia was noted in 24% of the patients, more often in patients with tumor localization in the fourth ventricle (26%) than in those with brainstem mass lesions (16%). Mapping of the caudal cranial nerve nuclei did not correlate with the dysfunction of these structures. CoMEP was significantly associated with the neurologic state of the CN. The decrease in CoMEP is a significant prognostic factor for postoperative bulbar symptoms appearance or aggravation. CONCLUSIONS Mapping the CN is an important identification tool. The CoMEP modality should be used intraoperatively to determine the functional state of the CN and predict postoperative dysphagia.
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Affiliation(s)
- Kristina Lapteva
- Department of Clinical Neurophysiology, N.N. Burdenko National Medical Research Center of Neurosurgery of the Ministry of Health of the Russian Federation, Moscow, Russian Federation.
| | - Andrey Gavrjushin
- Department of Neuro-oncology, N.N. Burdenko National Medical Research Center of Neurosurgery of the Ministry of Health of the Russian Federation, Moscow, Russian Federation
| | - David Pitskhelauri
- Department of Neuro-oncology, N.N. Burdenko National Medical Research Center of Neurosurgery of the Ministry of Health of the Russian Federation, Moscow, Russian Federation
| | - Tatiana Birg
- Department of Intensive Care Unit, N.N. Burdenko National Medical Research Center of Neurosurgery of the Ministry of Health of the Russian Federation, Moscow, Russian Federation
| | - Gleb Danilov
- Laboratory of Biomedical Informatics and Artificial Intelligence, N.N. Burdenko National Medical Research Center of Neurosurgery of the Ministry of Health of the Russian Federation, Moscow, Russian Federation
| | - Anna Ogurtsova
- Department of Clinical Neurophysiology, N.N. Burdenko National Medical Research Center of Neurosurgery of the Ministry of Health of the Russian Federation, Moscow, Russian Federation
| | - Yulia Strunina
- Laboratory of Biomedical Informatics and Artificial Intelligence, N.N. Burdenko National Medical Research Center of Neurosurgery of the Ministry of Health of the Russian Federation, Moscow, Russian Federation
| | - Ludmila Fomochkina
- Department of Otorhinolaryngology, N.N. Burdenko National Medical Research Center of Neurosurgery of the Ministry of Health of the Russian Federation, Moscow, Russian Federation
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Titov O, Bykanov A, Pitskhelauri D. Neurosurgical skills analysis by machine learning models: systematic review. Neurosurg Rev 2023; 46:121. [PMID: 37191734 DOI: 10.1007/s10143-023-02028-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2023] [Revised: 04/16/2023] [Accepted: 05/06/2023] [Indexed: 05/17/2023]
Abstract
Machine learning (ML) models are being actively used in modern medicine, including neurosurgery. This study aimed to summarize the current applications of ML in the analysis and assessment of neurosurgical skills. We conducted this systematic review in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. We searched the PubMed and Google Scholar databases for eligible studies published until November 15, 2022, and used the Medical Education Research Study Quality Instrument (MERSQI) to assess the quality of the included articles. Of the 261 studies identified, we included 17 in the final analysis. Studies were most commonly related to oncological, spinal, and vascular neurosurgery using microsurgical and endoscopic techniques. Machine learning-evaluated tasks included subpial brain tumor resection, anterior cervical discectomy and fusion, hemostasis of the lacerated internal carotid artery, brain vessel dissection and suturing, glove microsuturing, lumbar hemilaminectomy, and bone drilling. The data sources included files extracted from VR simulators and microscopic and endoscopic videos. The ML application was aimed at classifying participants into several expertise levels, analysis of differences between experts and novices, surgical instrument recognition, division of operation into phases, and prediction of blood loss. In two articles, ML models were compared with those of human experts. The machines outperformed humans in all tasks. The most popular algorithms used to classify surgeons by skill level were the support vector machine and k-nearest neighbors, and their accuracy exceeded 90%. The "you only look once" detector and RetinaNet usually solved the problem of detecting surgical instruments - their accuracy was approximately 70%. The experts differed by more confident contact with tissues, higher bimanuality, smaller distance between the instrument tips, and relaxed and focused state of the mind. The average MERSQI score was 13.9 (from 18). There is growing interest in the use of ML in neurosurgical training. Most studies have focused on the evaluation of microsurgical skills in oncological neurosurgery and on the use of virtual simulators; however, other subspecialties, skills, and simulators are being investigated. Machine learning models effectively solve different neurosurgical tasks related to skill classification, object detection, and outcome prediction. Properly trained ML models outperform human efficacy. Further research on ML application in neurosurgery is needed.
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Affiliation(s)
- Oleg Titov
- Burdenko Neurosurgery Center, Moscow, Russia.
- OPEN BRAIN, Laboratory of Neurosurgical Innovations, Moscow, Russia.
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Pitskhelauri D, Kudieva E, Vlasov P, Eliseeva N, Zaitsev O, Kamenetskaya M, Kozlova A, Shishkina L, Danilov G, Sanikidze A, Kuprava T, Ishkinin R, Melikyan A. Burr hole microsurgical subtemporal selective amygdalohippocampectomy. Acta Neurochir (Wien) 2023; 165:1215-1226. [PMID: 36867249 DOI: 10.1007/s00701-023-05536-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Accepted: 02/15/2023] [Indexed: 03/04/2023]
Abstract
INTRODUCTION At present, selective amygdalohippocampectomy (SAH) has become popular in the treatment of drug-resistant mesial temporal lobe epilepsy (TLE). However, there is still an ongoing discussion about the advantages and disadvantages of this approach. METHODS The study included a consecutive series of 43 adult patients with drug-resistant TLE, involving 24 women and 19 men (1.8/1). Surgeries were performed at the Burdenko Neurosurgery Center from 2016 to 2019. To perform subtemporal SAH through the burr hole with the diameter of 14 mm, we used two types of approaches: preauricular, 25 cases, and supra-auricular, 18 cases. The follow-up ranged from 36 to 78 months (median 59 months). One patient died 16 months after surgery (accident). RESULTS By the third year after surgery, Engel I outcome was achieved in 80.9% (34 cases) of cases and Engel II in 4 (9.5%) and Engel III and Engel IV in 4 (9.6%) cases. Among the patients with Engel I outcomes, anticonvulsant therapy was completed in 15 (44.1%), and doses were reduced in 17 (50%) cases. Verbal and delayed verbal memory decreased after surgery in 38.5% and 46.1%, respectively. Verbal memory was mainly affected by preauricular approach in comparison with supra-auricular (p = 0.041). In 15 (51.7%) cases, minimal visual field defects were detected in the upper quadrant. At the same time, visual field defects did not extend into the lower quadrant and inside the 20° of the upper affected quadrant in any case. CONCLUSIONS Burr hole microsurgical subtemporal SAH is an effective surgical procedure for drug-resistant TLE. It involves minimal risks of loss of visual field within the 20° of the upper quadrant. Supra-auricular approach, compared to preauricular, results in a reduction in the incidence of upper quadrant hemianopia and is associated with a lower risk of verbal memory impairment.
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Affiliation(s)
- David Pitskhelauri
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, 16 4th Tverskaya-Yamskaya St, 125047, Moscow, Russia.
| | - Elina Kudieva
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, 16 4th Tverskaya-Yamskaya St, 125047, Moscow, Russia
| | - Pavel Vlasov
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, 16 4th Tverskaya-Yamskaya St, 125047, Moscow, Russia
| | - Natalya Eliseeva
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, 16 4th Tverskaya-Yamskaya St, 125047, Moscow, Russia
| | - Oleg Zaitsev
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, 16 4th Tverskaya-Yamskaya St, 125047, Moscow, Russia
| | - Maria Kamenetskaya
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, 16 4th Tverskaya-Yamskaya St, 125047, Moscow, Russia
| | - Antonina Kozlova
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, 16 4th Tverskaya-Yamskaya St, 125047, Moscow, Russia
| | - Ludmila Shishkina
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, 16 4th Tverskaya-Yamskaya St, 125047, Moscow, Russia
| | - Gleb Danilov
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, 16 4th Tverskaya-Yamskaya St, 125047, Moscow, Russia
| | - Alexander Sanikidze
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, 16 4th Tverskaya-Yamskaya St, 125047, Moscow, Russia
| | | | - Ruslan Ishkinin
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, 16 4th Tverskaya-Yamskaya St, 125047, Moscow, Russia
| | - Armen Melikyan
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, 16 4th Tverskaya-Yamskaya St, 125047, Moscow, Russia
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Pitskhelauri D, Sufianov R, Konovalov A, Pronin I, Sanikidze A. Median trans-atlanto-occipital membrane microsurgical approach to the posterior cranial fossa without craniotomy. J Neurosurg 2023; 138:374-381. [PMID: 35901686 DOI: 10.3171/2022.5.jns22111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2022] [Accepted: 05/27/2022] [Indexed: 02/04/2023]
Abstract
Minimally invasive approaches are becoming increasingly popular and contributing to improving the results of the surgical treatment of a wide variety of intracranial pathologies. Fifteen patients with posterior cranial fossa tumors underwent microsurgery through the atlanto-occipital membrane without resection of any bone structures. Tumors were localized in the brainstem in 8 patients and in the fourth ventricle in 7 patients. According to preoperative MRI and CT scans, the distance between the posterior arch of the atlas and the opisthion ranged from 9.9 to 16.5 mm (median 13 mm). The surgery was performed with the patient in the prone position and the head flexed. The trajectory of the surgical approach was directed from the skin incision located above the C2 spinous process 3.5-4 cm rostral along the midline. Total tumor resection was performed in 10 patients, subtotal resection in 2 patients, partial resection in 1 patient, and open biopsy in 2 patients. Surgical complications occurred in only 1 patient (meningoencephalitis). This minimally invasive trans-atlanto-occipital membrane approach for posterior cranial fossa tumors provides adequate visualization of the caudal part of the fourth ventricle and brainstem when the anthropometric parameters of the patient are suitable.
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Affiliation(s)
- David Pitskhelauri
- 1Department of Neurooncology, N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, Moscow; and
| | - Rinat Sufianov
- 1Department of Neurooncology, N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, Moscow; and
| | - Alexander Konovalov
- 1Department of Neurooncology, N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, Moscow; and
| | - Igor Pronin
- 2Department of Neuroradiology, N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, Moscow, Russia
| | - Alexander Sanikidze
- 1Department of Neurooncology, N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, Moscow; and
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Bykanov AE, Pitskhelauri D, Batalov AI, Trube M, Danilov G, Golbin D. Anatomical and Technical Preparations of the Human Brain for White Matter Fibers Dissection with Electromagnetic Neuronavigation Assistance Technical Nuances for Application. World Neurosurg 2022; 168:173-178. [DOI: 10.1016/j.wneu.2022.09.122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 09/26/2022] [Accepted: 09/27/2022] [Indexed: 11/06/2022]
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Abramov I, Jubran JH, Houlihan LM, Park MT, Howshar JT, Farhadi DS, Loymak T, Cole TS, Pitskhelauri D, Preul MC. Multiple hippocampal transection for mesial temporal lobe epilepsy: A systematic review. Seizure 2022; 101:162-176. [PMID: 36041364 DOI: 10.1016/j.seizure.2022.08.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 08/02/2022] [Accepted: 08/19/2022] [Indexed: 11/28/2022] Open
Abstract
PURPOSE Multiple hippocampal transection (MHT) is a surgical technique that offers adequate seizure control with minimal perioperative morbidity. However, there is little evidence available to guide neurosurgeons in selecting this technique for use in appropriate patients. This systematic review analyzes patient-level data associated with MHT for intractable epilepsy, focusing on postoperative seizure control and memory outcomes. METHODS The systematic review was conducted in accordance with Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Relevant articles were identified from 3 databases (PubMed, Medline, Embase) up to August 1, 2021. Inclusion criteria were that the majority of patients had received a diagnosis of intractable epilepsy, the article was written in English, MHT was the primary procedure, and patient-level metadata were included. RESULTS Fifty-nine unique patients who underwent MHT were identified across 11 studies. Ten (17%) of 59 patients underwent MHT alone. Forty-three (75%) of 57 patients who had a follow-up 12 months or longer were seizure free at last follow-up. With respect to postoperative verbal memory retention, 9 of 38 (24%) patient test scores did not change, 14 (37%) decreased, and 16 (42%) increased. With respect to postoperative nonverbal memory retention, 12 of 38 (34%) patient test scores did not change, 13 (34%) decreased, and 13 (33%) increased. CONCLUSION There are few reported patients analyzed after MHT. Although the neurocognitive benefits of MHT are unproven, this relatively novel technique has shown promise in the management of seizures in patients with intractable epilepsy. However, structured trials assessing MHT in isolation are warranted.
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Affiliation(s)
- Irakliy Abramov
- The Loyal and Edith Davis Neurosurgical Research Laboratory, Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ
| | - Jubran H Jubran
- The Loyal and Edith Davis Neurosurgical Research Laboratory, Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ
| | - Lena Mary Houlihan
- The Loyal and Edith Davis Neurosurgical Research Laboratory, Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ
| | - Marian T Park
- The Loyal and Edith Davis Neurosurgical Research Laboratory, Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ
| | - Jacob T Howshar
- The Loyal and Edith Davis Neurosurgical Research Laboratory, Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ
| | - Dara S Farhadi
- The Loyal and Edith Davis Neurosurgical Research Laboratory, Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ
| | - Thanapong Loymak
- Department of Neurosurgery, Srisawan Hospital, Nakhonsawan, Thailand
| | - Tyler S Cole
- The Loyal and Edith Davis Neurosurgical Research Laboratory, Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ
| | - David Pitskhelauri
- Department of Neuro-Oncology, Burdenko Neurosurgical Center, Moscow, Russia
| | - Mark C Preul
- The Loyal and Edith Davis Neurosurgical Research Laboratory, Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ.
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Konovalov A, Pitskhelauri D, Serova N, Shishkina L, Abramov I. Pineal cyst management: A single-institution experience spanning two decades. Surg Neurol Int 2022; 13:350. [PMID: 36128100 PMCID: PMC9479525 DOI: 10.25259/sni_130_2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Accepted: 07/20/2022] [Indexed: 11/22/2022] Open
Abstract
Background: Pineal cysts (PCs) are benign lesions commonly found on intracranial imaging. Despite their high prevalence, there is no clear consensus on the most appropriate management of patients with PCs, especially those with symptomatic nonhydrocephalic cysts. Methods: A retrospective analysis was performed on 142 patients with PCs (103 surgical cases and 39 conservatively managed cases). Data were examined, including clinical presentation, imaging findings, ophthalmological status, natural course, postoperative outcomes, and complications. Results: Surgical group: the most common symptom was headache (92%), followed by signs of intracranial hypertension due to hydrocephalus (22%). New radiological feature of PCs was found in 11 patients. From 71 patients with long-term follow-up, headache completely resolved in 44 (62%) patients; marked improvement was observed in 20 (29%); in 7 (9%) – headache remained unchanged. The most common postoperative complication was neuro-ophthalmological disorders (23%), with a tendency for resolution in the long-term follow-up period. Neuro-ophthalmological symptoms at last follow-up included upward gaze palsy (6%) and skew deviation (5%), followed by convergence disorders (3%) and eyelid-retraction (2%). Natural course group: PC size remained stable in 34 (87%) patients during the follow-up period. The patient’s gender or age was not a significant predictor of cyst growth (P = 0.4, P = 0.56). Conclusion: The majority of patients with a newly diagnosed PC remain clinically and radiologically stable. Patients with nonhydrocephalic PCs and intractable headaches experience significant relief in headache symptoms, but are at risk of mild to moderate neuro-ophthalmological disorders. The natural course of PCs and factors promoting their growth still remains poorly defined.
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Affiliation(s)
- Alexander Konovalov
- Department of Neurosurgery, Burdenko Neurosurgery Center, Moscow, Russian Federation
| | - David Pitskhelauri
- Department of Neurosurgery, Burdenko Neurosurgery Center, Moscow, Russian Federation
| | - Natalia Serova
- Department of Neuro-Ophthalmology, Burdenko Neurosurgery Center, Moscow, Russian Federation
| | - Lyudmila Shishkina
- Department of Neuropathology, Burdenko Neurosurgery Center, Moscow, Russian Federation
| | - Irakliy Abramov
- Department of Neurosurgery, Burdenko Neurosurgery Center, Moscow, Russian Federation
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Postnov A, Toutain J, Pronin I, Valable S, Gourand F, Kalaeva D, Vikhrova N, Pyzhik E, Guillouet S, Kobyakov G, Khokholova E, Pitskhelauri D, Usachev D, Maryashev S, Rizhova M, Potapov A, Derlon JM. First-in-Man Noninvasive Initial Diagnostic Approach of Primary CNS Lymphoma Versus Glioblastoma Using PET With 18 F-Fludarabine and l -[methyl- 11 C]Methionine. Clin Nucl Med 2022; 47:699-706. [PMID: 35485864 DOI: 10.1097/rlu.0000000000004238] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVES This study sought to assess 18 F-fludarabine ( 18 F-FLUDA) PET/CT's ability in differentiating primary central nervous system lymphomas (PCNSLs) from glioblastoma multiformes (GBMs). PATIENTS AND METHODS Patients harboring either PCNSL (n = 8) before any treatment, PCNSL treated using corticosteroids (PCNSLh; n = 10), or GBM (n = 13) were investigated with conventional MRI and PET/CT, using 11 C-MET and 18 F-FLUDA. The main parameters measured with each tracer were SUV T and T/N ratios for the first 30 minutes of 11 C-MET acquisition, as well as at 3 different times after 18 F-FLUDA injection. The early 18 F-FLUDA uptake within the first minute of injection was equally considered, whereas this parameter was combined with the later uptakes to obtain R FLUDA 2 and R FLUDA 3 ratios. RESULTS No significant differences in 11 C-MET uptakes were observed among PCNSL, PCNSLh, and GBM. With 18 F-FLUDA, a clear difference in dynamic GBM uptake was observed, which decreased over time after an early maximum, as compared with that of PCNSL, which steadily increased over time, PCNSLh exhibiting intermediate values. The most discriminative parameters consisting of R FLUDA 2 and R FLUDA 3 integrated the early tracer uptake (first 60 seconds), thereby provided 100% specificity and sensitivity. CONCLUSIONS 18 F-FLUDA was shown to likely be a promising radiopharmaceutical for differentiating PCNSL from other malignancies, although a pretreatment with corticosteroids might compromise this differential diagnostic ability. The diagnostic role of 18 F-FLUDA should be further investigating, along with its potential of defining therapeutic strategies in patients with PCNSL, while assessing the treatments' effectiveness.
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Affiliation(s)
| | | | - Igor Pronin
- From the N.N. Burdenko National Medical Research Center of Neurosurgery
| | | | - Fabienne Gourand
- Normandie Univ, UNICAEN, CEA, CNRS, ISTCT/LDM-TEP group, GIP CYCERON, Caen, France
| | | | - Nina Vikhrova
- From the N.N. Burdenko National Medical Research Center of Neurosurgery
| | - Elena Pyzhik
- From the N.N. Burdenko National Medical Research Center of Neurosurgery
| | - Stéphane Guillouet
- Normandie Univ, UNICAEN, CEA, CNRS, ISTCT/LDM-TEP group, GIP CYCERON, Caen, France
| | - Grigoriy Kobyakov
- From the N.N. Burdenko National Medical Research Center of Neurosurgery
| | | | | | - Dmitry Usachev
- From the N.N. Burdenko National Medical Research Center of Neurosurgery
| | - Sergey Maryashev
- From the N.N. Burdenko National Medical Research Center of Neurosurgery
| | - Marina Rizhova
- From the N.N. Burdenko National Medical Research Center of Neurosurgery
| | - Alexander Potapov
- From the N.N. Burdenko National Medical Research Center of Neurosurgery
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Sufianov R, Pitskhelauri D, Bykanov A. Fourth Ventricle Tumors: A Review of Series Treated With Microsurgical Technique. Front Surg 2022; 9:915253. [PMID: 35733438 PMCID: PMC9207172 DOI: 10.3389/fsurg.2022.915253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Accepted: 05/02/2022] [Indexed: 11/25/2022] Open
Abstract
Tumors of the IV ventricle represent 1–5% of all intracranial lesions; they are implicated in 2/3 of the tumors of the ventricular system. According to modern standards, the first treatment stage for this pathology is microsurgical removal. Currently, for the removal of neoplasms of the IV ventricle and brainstem, the median suboccipital approach is widely used, followed by one of the microapproaches. Moreover, with the development of microsurgical techniques, keyhole approaches are now beginning to be utilized. However, surgical treatment of these tumors remains a challenge for neurosurgeons due to the proximity of functionally important anatomical structures (the brainstem, the cerebellum, pathways, vessels, etc.) of the posterior cranial fossa. Therefore, surgery in this area is associated with the possible occurrence of a wide range of postoperative complications. The authors provide a review of series of fourth ventricle tumors treated with microsurgical technique.
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Affiliation(s)
- Rinat Sufianov
- Department of Neurooncology, N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, Moscow, Russia
- Department of Neurosurgery, Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russia
- Correspondence: Rinat Sufianov
| | - David Pitskhelauri
- Department of Neurooncology, N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, Moscow, Russia
| | - Andrey Bykanov
- Department of Neurooncology, N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, Moscow, Russia
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Titov O, Bykanov A, Pitskhelauri D, Danilov G. Neuromonitoring of the language pathways using cortico-cortical evoked potentials: a systematic review and meta-analysis. Neurosurg Rev 2022; 45:1883-1894. [PMID: 35031897 DOI: 10.1007/s10143-021-01718-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2021] [Revised: 11/18/2021] [Accepted: 12/08/2021] [Indexed: 10/19/2022]
Abstract
Cortico-cortical evoked potentials (CCEPs) are a surge in activity of one cortical zone caused by stimulation of another cortical zone. Recording of CCEP may be a useful method of intraoperative monitoring of the brain pathways, particularly of the language-related tracts. We aimed to conduct a systematic review and meta-analysis, dedicated to the clinical question: Does the CCEP recording effectively predict the postoperative speech deficits in neurosurgical patients? We conducted language-restricted PubMed, Google Scholar, Scopus, and Cochrane database search for eligible studies of CCEP published until March 2021. There were 4 articles (3 case series and 1 case report), which met our inclusion/exclusion criteria. A total of 32 patients (30 cases of tumors and 2 cavernomas) included in the analysis were divided into two cohorts - quantitative and qualitative, in accordance with the method of evaluating changes in the amplitude of CCEP after the lesion resection and postoperative alterations in speech function. Quantitative variables were studied using the Spearman rank correlation coefficient. Categorical variables were compared in groups by Fisher's exact test. We found a strong positive correlation between the decrease in the N1 wave amplitude and the severity of postoperative speech deficits (quantitative cohort: r = 0.57, p = 0.01; qualitative cohort: p = 0.02). Thus, the CCEP method using the N1 wave amplitude as a marker enables to effectively predict postoperative speech outcomes. Nevertheless, the low level of evidence for the included works indicated the necessity for additional research on this issue.
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Affiliation(s)
- Oleg Titov
- Burdenko Neurosurgery Center, Moscow, Russia. .,OPEN BRAIN - Neurosurgical Laboratory of Open Access, Moscow, Russia.
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Ishankulov T, Danilov G, Pitskhelauri D, Titov O, Ogurtsova A, Buklina S, Gulaev E, Konakova T, Bykanov A. Prediction of Postoperative Speech Dysfunction Based on Cortico-Cortical Evoked Potentials and Machine Learning. Stud Health Technol Inform 2022; 289:33-36. [PMID: 35062085 DOI: 10.3233/shti210852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The possibility of postoperative speech dysfunction prediction in neurosurgery based on intraoperative cortico-cortical evoked potentials (CCEP) might provide a new basis to refine the criteria for the extent of intracerebral tumor resection and preserve patients' quality of life. In this study, we aimed to test the quality of predicting postoperative speech dysfunction with machine learning based on the initial intraoperative CCEP before tumor removal. CCEP data were reported for 26 patients. We used several machine learning models to predict speech deterioration following neurosurgery: a random forest of decision trees, logistic regression, support vector machine with different types of the kernel (linear, radial, and polynomial). The best result with F1-score = 0.638 was obtained by a support vector machine with a polynomial kernel. Most models showed low specificity and high sensitivity (reached 0.993 for the best model). Our pilot study demonstrated the insufficient quality of speech dysfunction prediction by solely intraoperative CCEP recorded before glial tumor resection, grounding our further research of CCEP postresectional dynamics.
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Affiliation(s)
- Timur Ishankulov
- Laboratory of Biomedical Informatics and Artificial Intelligence, National Medical Research Center for Neurosurgery named after N.N. Burdenko, Moscow, Russian Federation
| | - Gleb Danilov
- Laboratory of Biomedical Informatics and Artificial Intelligence, National Medical Research Center for Neurosurgery named after N.N. Burdenko, Moscow, Russian Federation
| | - David Pitskhelauri
- Laboratory of Biomedical Informatics and Artificial Intelligence, National Medical Research Center for Neurosurgery named after N.N. Burdenko, Moscow, Russian Federation
| | - Oleg Titov
- Laboratory of Biomedical Informatics and Artificial Intelligence, National Medical Research Center for Neurosurgery named after N.N. Burdenko, Moscow, Russian Federation
| | - Anna Ogurtsova
- Laboratory of Biomedical Informatics and Artificial Intelligence, National Medical Research Center for Neurosurgery named after N.N. Burdenko, Moscow, Russian Federation
| | - Svetlana Buklina
- Laboratory of Biomedical Informatics and Artificial Intelligence, National Medical Research Center for Neurosurgery named after N.N. Burdenko, Moscow, Russian Federation
| | - Evgeniy Gulaev
- National Medical Research Center of Traumatology and Orthopedics named after N.N. Priorov, Moscow, Russian Federation
| | - Tatyana Konakova
- Laboratory of Biomedical Informatics and Artificial Intelligence, National Medical Research Center for Neurosurgery named after N.N. Burdenko, Moscow, Russian Federation
| | - Andrey Bykanov
- Laboratory of Biomedical Informatics and Artificial Intelligence, National Medical Research Center for Neurosurgery named after N.N. Burdenko, Moscow, Russian Federation
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Pitskhelauri D, Bykanov A, Konovalov A, Danilov G, Buklina S, Sanikidze A, Sufianov R. Transsylvian Insular Glioma Surgery: New Classification System, Clinical Outcome in a Consecutive Series of 79 Cases. Neurosurgery 2021. [DOI: 10.1093/neuros/opab051_s167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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13
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Pitskhelauri D, Kudieva E, Kamenetskaya M, Kozlova A, Vlasov P, Dombaanai B, Eliseeva N, Shishkina L, Sanikidze A, Shults E, Moshev D, Pronin I, Melikyan A. Multiple hippocampal transections for mesial temporal lobe epilepsy. Surg Neurol Int 2021; 12:372. [PMID: 34513139 PMCID: PMC8422472 DOI: 10.25259/sni_350_2021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Accepted: 06/25/2021] [Indexed: 11/16/2022] Open
Abstract
Background: The purpose of this study was to evaluate the effectiveness of multiple hippocampal transections (MHT) in the treatment of drug-resistant mesial temporal lobe epilepsy. Methods: Six patients underwent MHT at Burdenko Neurosurgery Center in 2018. The age of the patients varied from 18 to 43 years. All patients suffered from refractory epilepsy caused by focal lesions of the mesial temporal complex or temporal pole in dominant side. Postoperative pathology revealed neuronal-glial tumors in two patients, focal cortical dysplasia (FCD) of the temporal pole – in two patients, cavernous angioma – in one patient, and encephalocele of the preuncal area – in one patient. Results: All patients underwent surgery satisfactorily. There were no postoperative complications except for homonymous superior quadrantanopia. This kind of visual field loss was noted in four cases out of six. During the follow-up period five patients out of six had Engel Class I outcome (83.3%). In one case, seizures developed after 1 month in a patient with FCD in the uncus (Engel IVA). After surgery, three out of six patients developed significant nominative aphasia. Two patients relative to the preoperative level demonstrated improvement in delayed verbal memory after MHT. Two patients showed a decrease level in delayed verbal memory. In preoperative period, visual memory was below the normal in one patient. Delayed visual memory in two cases impaired compared to the preoperative level. Conclusion: MHT can be considered as an effective method of drug-resistant mesial temporal lobe epilepsy caused by tumors of the medial temporal complex. At the same time, MHT makes it possible to preserve memory in patients with structurally preserved hippocampus. However, MHT do not guarantee the preservation of memory after surgery.
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Affiliation(s)
- David Pitskhelauri
- Department of Neurosurgery, Burdenko National Medical Research Center of Neurosurgery, Moscow, Russia
| | - Elina Kudieva
- Department of Neurosurgery, Burdenko National Medical Research Center of Neurosurgery, Moscow, Russia
| | - Maria Kamenetskaya
- Department of Neuropsychiatric Research, Burdenko National Medical Research Center of Neurosurgery, Moscow, Russia
| | - Antonina Kozlova
- Department of Neurophysiological Research, Burdenko National Medical Research Center of Neurosurgery, Moscow, Russia
| | - Pavel Vlasov
- Department of Pediatric Neurosurgery, Burdenko National Medical Research Center of Neurosurgery, Moscow, Russia
| | - Baiyr Dombaanai
- Department of Neurosurgery, Burdenko National Medical Research Center of Neurosurgery, Moscow, Russia
| | - Natalia Eliseeva
- Department of Neuroophthalmological Research, Burdenko National Medical Research Center of Neurosurgery, Moscow, Russia
| | - Lyudmila Shishkina
- Department of Neuropathology, Burdenko National Medical Research Center of Neurosurgery, Moscow, Russia
| | - Alexander Sanikidze
- Department of Neurosurgery, Burdenko National Medical Research Center of Neurosurgery, Moscow, Russia
| | - Evgeniy Shults
- Department of X-ray and Radioisotope Research, Burdenko National Medical Research Center of Neurosurgery, Moscow, Russia
| | - Dmitriy Moshev
- Department of Neuroanesthesiology, Burdenko National Medical Research Center of Neurosurgery, Moscow, Russia
| | - Igor Pronin
- Department of X-ray and Radioisotope Research, Burdenko National Medical Research Center of Neurosurgery, Moscow, Russia
| | - Armen Melikyan
- Department of Pediatric Neurosurgery, Burdenko National Medical Research Center of Neurosurgery, Moscow, Russia
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Konovalov A, Maryashev S, Pitskhelauri D, Siomin V, Golanov A, Dalechina A. The last decade's experience of management of central neurocytomas: Treatment strategies and new options. Surg Neurol Int 2021; 12:336. [PMID: 34345477 PMCID: PMC8326110 DOI: 10.25259/sni_764_2020] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Accepted: 06/05/2021] [Indexed: 11/19/2022] Open
Abstract
Background: The purpose of the presented work is to evaluate the last decade’s experience in surgical management of central neurocytoma (CN) and elucidate on the treatment strategies and new options. Methods: The current series consists of the remaining 125 patients (70 females and 55 males) operated on during the past decade from 2008 to 2018. Most tumors were resected through transcortical (n = 76, 61%), or transcallosal (n = 40, 32%) approaches. In 5 (4%) patients with predominantly posterior location of the tumor, non-dominant superior parietal lobule approach was utilized. Both approaches (transcortical + transcallosal) were used in 4 (3%) of cases. Seven consecutive patients with large CN underwent prophylactic intraventricular stenting to prevent hydrocephalus. Results: Gross total resection was achieved in 45 patients (36%), subtotal resection (STR) in 40 (32%) cases. After surgery, 63 (50%) patients had neurocognitive problems, including disorientation, attention deficit, global amnesia, short-term memory deficits, and perceptual motor and social cognition problems. A total of 26 patients (21%) had postoperative hemorrhage in the resection bed. Obstructive hydrocephalus was noted in 25 (20%) patients. The entrapment of the occipital and/or temporal horns was observed in seven cases. None of the seven patients with prophylactic intraventricular stents required shunting. Conclusion: Although high rates of gross total or STR can be expected, the mortality and morbidity remain significant even in the modern neurosurgical era. Prophylactic intraventricular stenting in patients with large posteriorly located tumors with hydrocephalus may prevent ventricular entrapment and shunting. The main risk factors for recurrence are presence of residual disease and Ki-67 index over 5%. Recurrent symptomatic tumors should be treated surgically, whereas asymptomatic progression can be managed with stereotactic radiosurgery. Both treatment modalities are associated with low risk of complications and high tumor control rates.
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Affiliation(s)
- Alexander Konovalov
- Department of Neurosurgery, N. N. Burdenko National Medical Research Center of Neurosurgery, Moscow, Russia
| | - Sergey Maryashev
- Department of Neurosurgery, N. N. Burdenko National Medical Research Center of Neurosurgery, Moscow, Russia
| | - David Pitskhelauri
- Department of Neurosurgery, N. N. Burdenko National Medical Research Center of Neurosurgery, Moscow, Russia
| | - Vitaly Siomin
- Department of Neurosurgery, Baptist Hospital of Miami, Miami Neuroscience Institute, Miami, Florida, United States
| | - Andrey Golanov
- Department of Radiation therapy and Radiosurgery, N.N. Burdenko National Medical Research Center of Neurosurgery, Moscow, Russia
| | - Aleksandra Dalechina
- Gamma Knife Center, N.N. Burdenko National Medical Research Center of Neurosurgery, Moscow, Russia
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Pitskhelauri D, Bykanov A, Konovalov A, Danilov G, Buklina S, Sanikidze A, Sufianov R. Transsylvian Insular Glioma Surgery: New Classification System, Clinical Outcome in a Consecutive Series of 79 Cases. Oper Neurosurg (Hagerstown) 2021; 20:541-548. [PMID: 33677610 DOI: 10.1093/ons/opab051] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Accepted: 12/11/2020] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Surgery of insular glial tumors remains a challenge because of high incidence of postoperative neurological deterioration and the complex anatomy of the insular region. OBJECTIVE To explore the prognostic role of our and Berger-Sanai classifications on the extent of resection (EOR) and clinical outcome. METHODS From 2012 to 2017, a transsylvian removal of insular glial tumors was performed in 79 patients. The EOR was assessed depending on magnetic resonance imaging scans performed in the first 48 h after surgery. RESULTS The EOR ≥90% was achieved in 30 (38%) cases and <90% in 49 (62.0%) cases. In the early postoperative period, the new neurological deficit was observed in 31 (39.2%) patients, and in 5 patients (6.3%), it persisted up to 3 mo.We proposed a classification of insular gliomas based on its volumetric and anatomical characteristics. A statistically significant differences were found between proposed classes in tumor volume before and after surgery (P < .001), EOR (P = .02), rate of epileptic seizures before the surgical treatment (P = .04), and the incidence of persistent postoperative complications (P = .03).In the logistic regression model, tumor location in zone II (Berger-Sanai classification) was the predictor significantly related to less likely EOR of ≥90% and the maximum rate of residual tumor detection (P = .02). CONCLUSION The proposed classification of the insular gliomas was an independent predictor of the EOR and persistent postoperative neurological deficit. According to Berger-Sanai classification, zone II was a predictor of less EOR through the transsylvian approach.
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Affiliation(s)
- David Pitskhelauri
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, Moscow, Russia
| | - Andrey Bykanov
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, Moscow, Russia
| | - Alexander Konovalov
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, Moscow, Russia
| | - Gleb Danilov
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, Moscow, Russia
| | - Svetlana Buklina
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, Moscow, Russia
| | - Alexander Sanikidze
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, Moscow, Russia
| | - Rinat Sufianov
- N. N. Burdenko National Medical Research Center of Neurosurgery, Ministry of Health of the Russian Federation, Moscow, Russia
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Abramov I, Zhao X, Belykh E, Lawton MT, Pitskhelauri D, Preul MC. Supracerebellar infratentorial inverted subchoroidal approach to lateral ventricle lesions: Anatomical study and illustrative case. Surg Neurol Int 2021; 12:39. [PMID: 33598355 PMCID: PMC7881503 DOI: 10.25259/sni_909_2020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 12/23/2020] [Indexed: 11/22/2022] Open
Abstract
Background: This study provides an anatomical description of a novel supracerebellar infratentorial inverted subchoroidal (SIIS) approach to the lateral ventricle. An illustrative case is presented in which this approach was used to simultaneously resect two tumors residing in the posterior fossa and lateral ventricle. Methods: The SIIS approach was performed on five cadaveric heads using microsurgical and endoscopic techniques. Target points were defined in the lateral ventricle, and quantitative analysis was performed to assess limits of exposure within the lateral ventricle. Two coronal reference planes corresponding to the anterior and posterior margins of the lateral ventricle body were defined. Distances from target points to reference planes were measured, and an imaging-based predicting system was provided according to obtained measurements to guide preoperative approach selection. Results: Mean (standard deviation) distances between the predefined target points indicating the anterior limits and the anterior plane were 9 (7.0) mm, 11 (5.8) mm, and 7 (5.1) mm; posterior limits had distances of 8 (3.0) mm, 17 (9.2) mm, 15 (9.2) mm, and 9 (7.2) mm to the posterior plane. Limiting factors of the choroidal fissure dissection were the venous angle anteriorly and thalamocaudate vein posteriorly. The position of the venous angle had a high negative correlation with the anterior exposure limit (r = –0.87, P < 0.001; r = –0.92, P < 0.001). Conclusion: A step-by-step anatomical description of a new SIIS approach is given, and a quantitative description of the limits of the exposure is provided to evaluate the application of this approach.
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Affiliation(s)
- Irakliy Abramov
- Department of Neurosurgery, Barrow Neurological Institute, Phoenix, Arizona, United States
| | - Xiaochun Zhao
- Department of Neurosurgery, Barrow Neurological Institute, Phoenix, Arizona, United States
| | - Evgenii Belykh
- Department of Neurosurgery, Barrow Neurological Institute, Phoenix, Arizona, United States
| | - Michael T Lawton
- Department of Neurosurgery, Barrow Neurological Institute, Phoenix, Arizona, United States
| | - David Pitskhelauri
- Department of Neuro-oncology, Burdenko Neurosurgery Center, Moscow, Russian Federation
| | - Mark C Preul
- Department of Neurosurgery, Barrow Neurological Institute, Phoenix, Arizona, United States
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Pitskhelauri D, Konovalov A, Kudieva E, Bykanov A, Pronin I, Eliseeva N, Melnikova-Pitskhelauri T, Melikyan A, Sanikidze A. Burr Hole Microsurgery for Intracranial Tumors and Mesial Temporal Lobe Epilepsy: Results of 200 Consecutive Operations. World Neurosurg 2019; 126:e1257-e1267. [DOI: 10.1016/j.wneu.2019.02.239] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 02/25/2019] [Accepted: 02/26/2019] [Indexed: 12/26/2022]
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Pitskhelauri D, Kudieva E, Moshchev D, Ananev E, Shifrin M, Danilov G, Melnikova-Pitskhelauri T, Kachkov I, Bykanov A, Sanikidze A. Cisterna magna arachnoid membrane suturing decreases incidence of pseudomeningocele formation and incisional CSF leakage. Acta Neurochir (Wien) 2018; 160:1079-1087. [PMID: 29557532 DOI: 10.1007/s00701-018-3507-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Accepted: 02/27/2018] [Indexed: 10/17/2022]
Abstract
OBJECTIVE A pseudomeningocele and an incisional cerebrospinal fluid leak are considered frequent complications following neurosurgical operations. The rate of these complications especially increases following neurosurgical procedures on the posterior cranial fossae. According to some publications, the rate of pseudomeningoceles has been reported as high as 40%, whereas that of incisional cerebrospinal fluid leaks is up to 17%. For the purposes of reducing the risk of these complications after a midline suboccipital craniotomy, we propose suturing the arachnoid membrane of the cisterna magna. In this paper, we present a retrospective analysis of arachnoid membrane suturing. METHODS Seventy patients underwent midline suboccipital craniotomy by the first author between 2012 and 2016 at Burdenko Neurosurgery Institute. In this group was included a consecutive group of patients with posterior fossae tumors where the approach was performed through the cisterna magna arachnoid membrane following midline suboccipital craniotomy and dural opening. The patients were divided into two groups. Group 1 included 38 patients to whom cisterna magna arachnoid membrane suturing was performed with monofilament nonabsorbable suture 7.0., and additionally, the suture was sealed with fibrin adhesive sealant TachoComb®. Group 2 included 32 patients without arachnoid membrane suturing. There was no other significant difference in terms of clinical signs and surgical procedures between these groups. In the postoperative period, the frequency of developing a pseudomeningocele and an incisional cerebrospinal fluid leak was assessed in these two groups. The results were evaluated on the basis of clinical, CT, and MRI data performed in the postoperative period. RESULTS In the patients who underwent arachnoid membrane suturing (group I), pseudomeningocele formation was observed in one (2.6%) and CSF leak in one (2.6%) of the 38 patients. In group II, in which patients had no arachnoid membrane suturing, we observed pseudomeningocele formation in 11 (34.4%) patients and a CSF leak in 7 (25.0%) out of 28 patients with known follow-up. Statistical analysis of the data indicates a significantly higher risk of postoperative pseudomeningocele formation and/or an incisional cerebrospinal fluid leak in a group of patients who did not undergo arachnoid membrane suturing (p < 0.05). CONCLUSIONS Suturing of the arachnoid membrane of the cisterna magna and its further sealing with fibrin adhesive sealant TachoComb® create an additional barrier for preventing cerebrospinal fluid collection in the extradural space. This technique significantly reduces the risk of postoperative pseudomeningocele formation and/or an incisional cerebrospinal fluid leak in patients with midline suboccipital craniotomy.
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