المؤلفون: Caton, MT, Narsinh, KH, Baker, A, Dowd, CF, Higashida, RT, Cooke, DL, Hetts, SW, Halbach, VV, Amans, MR

المصدر: AJNR. American journal of neuroradiology. 42(8)

مصطلحات موضوعية: Foramen Magnum, Cranial Sinuses, Humans, Central Nervous System Vascular Malformations, Cerebral Angiography, Retrospective Studies, Phenotype, Middle Aged, Female, Male, Neurosciences, Brain Disorders, Clinical Sciences, Nuclear Medicine & Medical Imaging

الوصف: Background and purposeAVFs of the foramen magnum region, including fistulas of the marginal sinus and condylar veins, have complex arterial supply, venous drainage, symptoms, and risk features that are not well-defined. The purpose of this study was to present the angioarchitectural and clinical phenotypes of a foramen magnum region AVF from a large, single-center experience.Materials and methodsWe retrospectively reviewed cases from a 10-year neurointerventional data base. Arterial and venous angioarchitectural features and clinical presentation were extracted from the medical record. Venous drainage patterns were stratified into 4 groups as follows: type 1 = unrestricted sinus drainage, type 2 = sinus reflux (including the inferior petrosal sinus), type 3 = reflux involving sinuses and cortical veins, and type 4 = restricted cortical vein outflow or perimedullary congestion.ResultsTwenty-eight patients (mean age, 57.9 years; 57.1% men) had 29 foramen magnum region AVFs. There were 11 (37.9%) type 1, nine (31.0%) type 2, six (20.7%) type 3, and 3 (10.3%) type 4 fistulas. Pulsatile tinnitus was the most frequent symptom (82.1%), followed by orbital symptoms (31.0%), subarachnoid hemorrhage (13.8%), cranial nerve XII palsy (10.3%), and other cranial nerve palsy (6.9%). The most frequent arterial supply was the ipsilateral ascending pharyngeal artery (93.1% ipsilateral, 55.5% contralateral), vertebral artery (89.7%), occipital artery (65.5%), and internal carotid artery branches (48.3%).ConclusionsWe present the largest case series of foramen magnum region AVFs to date and show that clinical features relate to angioarchitecture. Orbital symptoms are frequent when sinus reflux is present. Hemorrhage was only observed in type 3 and 4 fistulas.

وصف الملف: application/pdf

الوصول الحر: https://escholarship.org/uc/item/5fc9j81zTest

المؤلفون: Layton, Ryan G., Pontier, Joshua F., Bins, Griffin P., Sucher, Brandon J., Runyan, Christopher M.

المصدر: Cleft Palate Craniofacial Journal; May2023, Vol. 60 Issue 5, p591-600, 10p

مصطلحات موضوعية: SUTURING, MUSCULOSKELETAL system diseases, GENETIC mutation, GENETICS, OCCIPITAL bone, CRANIOFACIAL dysostosis, RETROSPECTIVE studies, REGRESSION analysis, FORAMEN magnum, CEPHALOMETRY, COMPUTED tomography

مستخلص: Objective : To identify skull-base growth patterns in Crouzon syndrome, we hypothesized premature minor suture fusion restricts occipital bone development, secondarily limiting foramen magnum expansion. Design : Skull-base suture closure degree and cephalometric measurements were retrospectively studied using preoperative computed tomography (CT) scans and multiple linear regression analysis. Setting : Evaluation of multi-institutional CT images and 3D reconstructions from Wake Forest's Craniofacial Imaging Database (WFCID). Patients : Sixty preoperative patients with Crouzon syndrome under 12 years-old were selected from WFCID. The control group included 60 age- and sex-matched patients without craniosynostosis or prior craniofacial surgery. Interventions : None Main Outcomes Measure(s) : 2D and 3D cephalometric measurements. Results : 3D volumetric evaluation of the basioccipital, exo-occipital, and supraoccipital bones revealed decreased growth in Crouzon syndrome, attributed solely to premature minor suture fusion. Spheno-occipital (β = −398.75; P <.05) and petrous-occipital (β = −727.5; P <.001) suture fusion reduced growth of the basioccipital bone; lambdoid suture (β = −14 723.1; P <.001) and occipitomastoid synchondrosis (β = −16 419.3; P <.001) fusion reduced growth of the supraoccipital bone; and petrous-occipital suture (β = −673.3; P <.001), anterior intraoccipital synchondrosis (β = −368.47; P <.05), and posterior intraoccipital synchondrosis (β = −6261.42; P <.01) fusion reduced growth of the exo-occipital bone. Foramen magnum morphology is restricted in Crouzon syndrome but not directly caused by early suture fusion. Conclusions : Premature minor suture fusion restricts the volume of developing occipital bones providing a plausible mechanism for observed foramen magnum anomalies. [ABSTRACT FROM AUTHOR]

: Copyright of Cleft Palate Craniofacial Journal is the property of Sage Publications Inc. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Lou, Yongli, Yang, Jichao, Gu, Haoyuan, Xu, Guanghua, Ji, Shanfeng, Xu, Chi, Liu, Yong

المصدر: BioMed Research International; 10/13/2022, p1-10, 10p

مصطلحات موضوعية: SURGICAL decompression, RETROSPECTIVE studies, MAGNETIC resonance imaging, DISEASE relapse, FORAMEN magnum, ARNOLD-Chiari deformity, SYRINGOMYELIA, POSTOPERATIVE period, DESCRIPTIVE statistics, CEREBROSPINAL fluid

مستخلص: Objective. Combining the dynamics of cerebrospinal fluid, our study investigates the clinical effects of syringomyelia after the combination of fourth ventricle-subarachnoid shunt (FVSS) for recurrent Chiari (type I) malformations after cranial fossa decompression (foramen magnum decompression (FMD)). Methods. From December 2018 to December 2020, 15 patients with recurrent syringomyelia following posterior fossa decompression had FVSS surgery. Before and after the procedure, the clinical and imaging data of these individuals were retrospectively examined. Results. Following FVSS, none of the 15 patients experienced infection, nerve injury, shunt loss, or obstruction. 13 patients improved dramatically after surgery, while 2 patients improved significantly in the early postoperative period, but the primary symptoms returned 2 months later. The Japanese Orthopedic Association (JOA) score was 12.67 ± 3.95 , which was considerably better than preoperatively (t = 3.69 , P 0.001). The MRI results revealed that the cavities in 13 patients were reduced by at least 50% compared to the cavities measured preoperatively. The shrinkage rate of syringomyelia was 86.67% (13/15). One patient's cavities nearly vanished following syringomyelia. The size of the cavity in the patient remain unchanged, and the cavity's maximal diameter was significantly smaller than the size measured preoperatively (P < 0.001) PC-MRI results indicated that the peak flow rate of cerebrospinal fluid at the central segment of the midbrain aqueduct and the foramen magnum in patients during systole and diastole were significantly reduced after surgery (P < 0.05). Conclusion. After posterior fossa decompression, FVSS can effectively restore the smooth circulation of cerebrospinal fluid and alleviate clinical symptoms in patients with recurrent Chiari (type I) malformation and syringomyelia. It is a highly effective way of treatment. [ABSTRACT FROM AUTHOR]

: Copyright of BioMed Research International is the property of Hindawi Limited and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Putrevu, VenkataPravallika, Thodika, Unais, Raiyani, Yatin, Mangaleswaran, Balamurugan

المصدر: Journal of Pediatric Neurosciences; Jan-Mar2022, Vol. 17 Issue 1, p36-40, 5p

مصطلحات موضوعية: BRAIN, AGE distribution, MAGNETIC resonance imaging, RETROSPECTIVE studies, ACQUISITION of data, FORAMEN magnum, SEX distribution, ARNOLD-Chiari deformity, MEDICAL records, DESCRIPTIVE statistics, DATA analysis software, CHILDREN

مستخلص: Introduction: The position of the tonsillar tip in relation to the foramen magnum varies from individual to individual, even after excluding all predisposing factors that might alter the tonsillar tip position; the mere presence of the tonsillar ectopia should not be misinterpreted as Chiari malformation. Aim: Our aim is to establish the normal range of the tonsillar tip position and the incidence of tonsillar ectopia and its relation to age and sex in asymptomatic Indian children with structurally normal MRI brain imaging. Materials and Methods: We have conducted a retrospective data collection comprising 301 structurally normal MRI brain images done for children younger than 14 years, in which we measured the level of the tonsillar tip from the foramen magnum by taking the Mc Rae line as constant. Measurements were taken in the right and left parasagittal sections of T1-weighted MRI brain images by using pre-existing software. Statistical Analysis Used: Data analysis was done by SPSS v 25.0; all P values <0.05 were considered statistically significant. Results and Conclusion: The incidence of tonsillar ectopia in Indian children was about 13.79%, and the median tonsillar position was 3.2 mm above the foramen magnum with a median range of 5.2 mm above to the level of the foramen magnum (0). [ABSTRACT FROM AUTHOR]

: Copyright of Journal of Pediatric Neurosciences is the property of Wolters Kluwer India Pvt Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Dragoş-Ionuţ Mincă, Petrinel Mugurel Rădoi, Mugurel Constantin Rusu, Corneliu Toader

المصدر: Folia Morphologica. 81:781-784

مصطلحات موضوعية: Adult, Histology, Transverse sinuses, Dura mater, Cranial Sinuses, Occipital sinus, otorhinolaryngologic diseases, medicine, Humans, Retrospective Studies, Sigmoid sinus, Foramen magnum, Transverse Sinuses, business.industry, Anatomy, Middle Aged, medicine.anatomical_structure, Posterior cranial fossa, medicine.vein, Dural venous sinuses, Drainage, Female, Superior Sagittal Sinus, business, Superior sagittal sinus

الوصف: The endothelial-lined dural venous sinuses collect blood from the brain, meninges, and calvaria and drain it to the internal jugular veins. The adult drainage pathway of the venous sinuses confluent is commonly via the transverse and sigmoid sinuses to the jugular bulb. The occipital (OS) and marginal (MS) sinuses are well-represented before birth, in most cases. During a retrospective study of the computed tomography angiograms of a 64 y.o. female was found a rare combination of variants of the posterior fossa sinuses. The confluence of the dural venous sinuses was rhomboidal and drained superiorly the superior sagittal sinus, and inferiorly a well-represented occipital sinus (OS). The transverse sinuses were aplastic, on the right side, and hypoplastic on the opposite side. The OS further drained into the MS which, on each side, emptied into the respective jugular bulb. On each side a condylar vein left the junction of the sigmoid sinus and jugular bulb. Such posterior fossa drainage, exclusively on the OS-MS pathway, should be kept in mind when transections of the venous sinuses are intended during neurosurgical approaches of the foramen magnum. The OS-MS drainage is rather a persisting fetal pattern. The bilateral anatomical exclusion of the transverse sinuses is an added condition to spare the OS and MS.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4d2512aa928f7a54a6b69a80867b4d49Test
https://doi.org/10.5603/fm.a2021.0070Test

المؤلفون: Sara Cabet, Alexandru Szathmari, Carmine Mottolese, Patricia Franco, Laurent Guibaud, Massimiliano Rossi, Federico Di Rocco

المصدر: Child's Nervous System. 38:1137-1145

مصطلحات موضوعية: Radiography, Child, Preschool, Pediatrics, Perinatology and Child Health, Cervical Vertebrae, Humans, Female, Constriction, Pathologic, Foramen Magnum, Neurology (clinical), General Medicine, Child, Achondroplasia, Retrospective Studies

الوصف: To characterize natural history and early changes of craniovertebral junction stenosis in achondroplasia correlating with clinical and radiological outcome.Retrospective measures on craniovertebral junction were performed blindly, on sagittal T2-weighted images, in 21 patients with achondroplasia referred from 2008 to 2020. Clinical and polysomnography data were retrospectively collected. Each patient was paired for age and gender with four controls. Wilcoxon means comparison or Student's t-tests were applied.Twenty-one patients (11 females, from 0.1 to 39 years of age) were analyzed and paired with 84 controls. A craniovertebral junction stenosis was found in 11/21 patients (52.4%), all before the age of 2 years. Despite a significant reduction of the foramen magnum diameter (mean ± SD: patients 13.6 ± 6.2 mm, controls 28.5 ± 4.7 mm, p .001), craniovertebral junction stenosis resulted from the narrowing of C2 dens-opisthion antero-posterior diameter (8.7 ± 3.9 mm vs 24.6 ± 5.1 mm, p .001). Other significant changes were opisthion anterior placement (-0.4 ± 2.8 mm vs 9.4 ± 2.3 mm, p .001), posterior tilt of C2 (46.2 ± 13.7° vs 31.6 ± 7.9°, p .001) and of C1 (15.1 ± 4.3° vs 11.9 ± 5.0°, p = 0.01), and dens thickening (9.4 ± 2.2 mm vs 8.5 ± 2.1 mm, p = 0.03), allowing to define three distinguishable early craniovertebral junction patterns in achondroplasia. All children with C2-opisthion antero-posterior diameter of more than 6 mm had a better clinical and radiological outcome.Craniovertebral junction in achondroplasia results from narrowing between C2 dens and opisthion related to anterior placement of opisthion, thickening of C2 dens, and posterior tilt of C1-C2. A threshold of 6 mm for dens-opisthion sagittal diameter seems to correlate with clinical and radiological outcome.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e8b0c005923e5a02e2514e1b0034d520Test
https://doi.org/10.1007/s00381-022-05514-7Test

المؤلفون: Marie-Lise C. van Veelen, Mark J W van der Oest, Irene M.J. Mathijssen, Marjolein H G Dremmen, Bianca K. den Ottelander, Catherine A de Planque

المساهمون: Plastic and Reconstructive Surgery and Hand Surgery, Radiology & Nuclear Medicine, Neurosurgery

المصدر: Journal of Plastic, Reconstructive and Aesthetic Surgery, 75(2), 797-805. Churchill Livingstone

مصطلحات موضوعية: musculoskeletal diseases, congenital, hereditary, and neonatal diseases and abnormalities, Apert syndrome, Craniosynostosis, Craniosynostoses, Clivus, Humans, Medicine, Retrospective Studies, Skull Base, Foramen magnum, business.industry, Craniofacial Dysostosis, Infant, Newborn, Infant, Crouzon syndrome, Syndrome, Anatomy, Acrocephalosyndactylia, Synostosis, medicine.disease, Hydrocephalus, Skull, medicine.anatomical_structure, Surgery, business

الوصف: Purpose: Cerebellar tonsillar herniation (TH) occurs frequently in syndromic craniosynostosis; however, the exact pathogenesis is unknown. This study evaluates the association between skull base deformities and TH in syndromic craniosynostosis. Methods: Retrospective study MRI study comparing syndromic craniosynostosis to controls. Measured parameters included clivus length, skull base angle, Boogard's angle, foramen magnum area, and cerebellar tonsillar position (TP). The association between skull base parameters and TP was evaluated with linear mixed models, correcting for age and risk factors for TH in craniosynostosis (hydrocephalus, intracranial hypertension, craniocerebral disproportion, and lambdoid synostosis). Results: Two hundred and eighty-two scans in 145 patients were included, and 146 scans in 146 controls. The clivus was smaller at birth, and its growth was retarded in all syndromes. The skull base angle was smaller at birth in Apert and Crouzon syndromes, and the evolution through time was normal. Boogard's angle was smaller at birth in Apert syndrome, and its evolution was disturbed in Apert and Saethre-Chotzen syndromes. The foramen magnum was smaller at birth in Crouzon and Saethre-Chotzen syndromes, and its growth was disturbed in Apert, Crouzon, and Saethre-Chotzen syndromes. TP was higher at birth in Apert syndrome, but lowered faster. In Crouzon syndrome, TP was lower at birth and throughout life. A smaller clivus and larger foramen magnum were associated with a lower TP in controls (p

وصف الملف: application/pdf

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ed2e6a46c4a1de0b0ebc6a9bd91413d9Test
https://pure.eur.nl/en/publications/d4e2c0e2-b100-4088-b063-db27ed20eaf3Test

المؤلفون: Matthew R Amans, Randall T. Higashida, Daniel L Cooke, Amanda Baker, Christopher F. Dowd, Michael T. Caton, Van V. Halbach, S.W. Hetts, Kazim H. Narsinh

المصدر: AJNR. American journal of neuroradiology, vol 42, iss 8
AJNR Am J Neuroradiol

مصطلحات موضوعية: Male, medicine.medical_specialty, Vertebral artery, Clinical Sciences, Cranial Sinuses, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, 0302 clinical medicine, Dural arteriovenous fistulas, medicine.artery, medicine, Humans, Radiology, Nuclear Medicine and imaging, Foramen Magnum, Occipital artery, Sinus (anatomy), Retrospective Studies, Central Nervous System Vascular Malformations, Foramen magnum, Interventional, business.industry, Ascending pharyngeal artery, Neurosciences, Inferior petrosal sinus, Middle Aged, medicine.disease, Cerebral Angiography, Brain Disorders, Nuclear Medicine & Medical Imaging, Phenotype, medicine.anatomical_structure, Female, Neurology (clinical), Radiology, Internal carotid artery, business, 030217 neurology & neurosurgery

الوصف: BACKGROUND AND PURPOSE: AVFs of the foramen magnum region, including fistulas of the marginal sinus and condylar veins, have complex arterial supply, venous drainage, symptoms, and risk features that are not well-defined. The purpose of this study was to present the angioarchitectural and clinical phenotypes of a foramen magnum region AVF from a large, single-center experience. MATERIALS AND METHODS: We retrospectively reviewed cases from a 10-year neurointerventional data base. Arterial and venous angioarchitectural features and clinical presentation were extracted from the medical record. Venous drainage patterns were stratified into 4 groups as follows: type 1 = unrestricted sinus drainage, type 2 = sinus reflux (including the inferior petrosal sinus), type 3 = reflux involving sinuses and cortical veins, and type 4 = restricted cortical vein outflow or perimedullary congestion. RESULTS: Twenty-eight patients (mean age, 57.9 years; 57.1% men) had 29 foramen magnum region AVFs. There were 11 (37.9%) type 1, nine (31.0%) type 2, six (20.7%) type 3, and 3 (10.3%) type 4 fistulas. Pulsatile tinnitus was the most frequent symptom (82.1%), followed by orbital symptoms (31.0%), subarachnoid hemorrhage (13.8%), cranial nerve XII palsy (10.3%), and other cranial nerve palsy (6.9%). The most frequent arterial supply was the ipsilateral ascending pharyngeal artery (93.1% ipsilateral, 55.5% contralateral), vertebral artery (89.7%), occipital artery (65.5%), and internal carotid artery branches (48.3%). CONCLUSIONS: We present the largest case series of foramen magnum region AVFs to date and show that clinical features relate to angioarchitecture. Orbital symptoms are frequent when sinus reflux is present. Hemorrhage was only observed in type 3 and 4 fistulas.

وصف الملف: application/pdf

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::00f884cf5a6e6efc15761c0981eecb4eTest
https://doi.org/10.3174/ajnr.a7152Test

المؤلفون: Srinivas, Dwarakanath, Sarma, Pragyan, Deora, Harsh, Beniwal, Manish, Vikas, V, Rao, K, Chandramouli, B, Somanna, Sampath, Rao, K V L N, Chandramouli, B A

المصدر: Neurology India; Jan/Feb2019, Vol. 67 Issue 1, p142-148, 7p

مصطلحات موضوعية: MANDIBULAR condyle, NEUROPHYSIOLOGIC monitoring, CRANIAL nerves, ONCOLOGIC surgery, NEUROSURGERY, OCCIPITAL bone, RETROSPECTIVE studies, MAGNETIC resonance imaging, FORAMEN magnum, CANCER, TREATMENT effectiveness, MENINGIOMA, MENINGES, COMPUTED tomography, SKULL tumors

مصطلحات جغرافية: INDIA

مستخلص: Introduction: Anterior and anterolaterally situated foramen magnum meningiomas are a technically complex subgroup of meningiomas. The need for an extensive exposure and bone work and their complex anatomy make them a difficult and challenging group of tumors to resect. The bone work has ranged from an extensive condylar resection to condylar preserving exposures. In this paper, we present our experience with condylar preserving or minimal condylar resection based approaches to these tumors.Materials and Methods: All patients who underwent surgical resection of anterior and anterolaterally situated foramen magnum meningiomas were included in the analysis. The study period was more than 10 years from 2005 to 2015 at our institute; a tertiary referral centre in India. The records along with demographic profile, clinico-radiological features, surgical strategies, outcomes as well as mortality and morbidity were analysed.Results: There were a total of 20 patients (9 males and 11 females) who were operated during the study period. The average age was 36.7 years. In 16 patients, gross-total or near-total resection could be achieved, four patients underwent subtotal resection. Eight patients had fresh morbidity in the form of new motor deficits, pseudomeningocele formation, worsening of the lower cranial nerve functions or post-operative adhesions leading to syrinx formation. The follow-up ranged from 6 months to 140 months.Conclusion: Foramen magnum meningiomas are an eminently treatable group of tumors. Condylar preservation provides a good visualization, while helping to preserve joint stability and in avoiding instrumental stabilization. [ABSTRACT FROM AUTHOR]

: Copyright of Neurology India is the property of Wolters Kluwer India Pvt Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Hao Wu, Qingyu Yao, Fengzeng Jian, Can Zhang, Wanru Duan, Zan Chen, Jian Guan, Longbing Ma, Chenghua Yuan, Zhenlei Liu, Xingwen Wang, Kai Wang, Lei Cheng

المصدر: World Neurosurgery. 144:e178-e188

مصطلحات موضوعية: Adult, Male, Pathology, medicine.medical_specialty, Adolescent, Dura mater, Cisterna magna, Neurosurgical Procedures, Young Adult, 03 medical and health sciences, Postoperative Complications, 0302 clinical medicine, Cerebrospinal fluid, medicine.artery, medicine, Foramen, Humans, Foramen Magnum, Aged, Retrospective Studies, Foramen magnum, business.industry, Cerebral Arteries, Middle Aged, Decompression, Surgical, medicine.disease, Magnetic Resonance Imaging, Subdural Effusion, Syringomyelia, Treatment Outcome, Posterior inferior cerebellar artery, medicine.anatomical_structure, 030220 oncology & carcinogenesis, Tonsil, Female, Surgery, Neurology (clinical), Arachnoid, business, 030217 neurology & neurosurgery, Follow-Up Studies

الوصف: Objective This article discusses the procedure of foramina magnum and Magendie dredging, summarizing the pathologic changes in the intradural region of the craniocervical junction in patients with syringomyelia and the pathophysiologic mechanism of cerebrospinal fluid (CSF) circulation obstruction. Methods Clinical data from 50 adult patients with syringomyelia treated at Xuanwu Hospital from July 2018 to January 2019 were collected and retrospectively analyzed. All operations were performed with foramina magnum and Magendie dredging, and all intradural factors that may have induced the obstruction of CSF circulation were recorded. Results Intradural pathology was found in all patients. The pathologic changes that may have caused obstruction of the CSF circulation include tonsil occupying the foramen magnum and overlying foramen of Magendie in 88% (44/50), intertonsillar arachnoid adhesions in 36% (18/50), tonsil to medulla arachnoid adhesions in 18% (9/50), medialized tonsils in 70% (35/50), vermian branch of posterior inferior cerebellar artery in 22% (11/50), arachnoid veil in 16% (8/50), cisterna magna cyst in 4% (2/50), and tonsil to dura mater arachnoid adhesions in 8% (4/50). Mean duration of follow-up was 13.3 months. The long-term effective rate was 96.0%. Postoperative magnetic resonance imaging revealed that the size of the syringomyelia was reduced or completely resolved in 88% of patients. The mean preoperative Japanese Orthopaedic Association score was 12.9 ± 3.1, which improved to 14.7 ± 3.2 (P Conclusions Intradural pathology that causes CSF circulation obstruction exists in many forms. Relieving the obstruction of the foramen magnum and foramen of Magendie is key to surgical treatment.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f3b7332fcd415cd9c4e88e49ea1a7c0cTest
https://doi.org/10.1016/j.wneu.2020.08.068Test