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Imaging revealed a well-circumscribed 3-cm extraaxial T1-weighted isointense and T2-weighted hyperintense contrast-enhancing mass centered in the region of the right lateral cerebellomedullary cistern. The patient underwent resection of the lesion. Although the intraoperative appearance was suggestive of a cavernous malformation, some histological findings were atypical, leading to the final diagnosis of vascular malformation, not otherwise specified. The patient\u2019s postoperative course was uneventful with complete resolution of symptoms. To the authors\u2019 knowledge, this is the first report of an AOVM involving the intracranial portion of the accessory nerve. For any AOVM located within the cerebellomedullary cistern or one suspected of involving a cranial nerve, the authors recommend including immunohistochemistry with primary antibody to neurofilament in the histopathology workup.<\/jats:p>","DOI":"10.3171\/2015.6.jns131105","type":"journal-article","created":{"date-parts":[[2015,11,13]],"date-time":"2015-11-13T14:59:49Z","timestamp":1447426789000},"page":"167-172","source":"Crossref","is-referenced-by-count":1,"title":["Angiographically occult vascular malformation of the intracranial accessory nerve: case report"],"prefix":"10.3171","volume":"125","author":[{"given":"Sergei","family":"Terterov","sequence":"first","affiliation":[{"name":"Departments of Neurosurgery and"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nancy","family":"McLaughlin","sequence":"additional","affiliation":[{"name":"Departments of Neurosurgery and"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Harry","family":"Vinters","sequence":"additional","affiliation":[{"name":"Pathology, David Geffen School of Medicine at UCLA, Los Angeles, California"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Neil A.","family":"Martin","sequence":"additional","affiliation":[{"name":"Departments of Neurosurgery and"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1754","reference":[{"key":"b1-jns131105","series-title":"Surg Neurol","doi-asserted-by":"publisher","first-page":"82","DOI":"10.1016\/j.surneu.2007.04.008","article-title":"Cavernous angioma of the vestibular nerve: case report and literature review","volume":"70","author":"Adachi","year":"2008"},{"key":"b2-jns131105","series-title":"Neurosurgery","first-page":"onsE135","article-title":"Calcified extra-axial cavernoma involving lower cranial nerves: technical case report","volume":"64","author":"Albanese","year":"2009"},{"key":"b3-jns131105","series-title":"J Comput Assist Tomogr","doi-asserted-by":"publisher","first-page":"357","DOI":"10.1097\/00004728-199905000-00006","article-title":"Cavernous hemangioma of the intracranial optic pathways: CT and MRI","volume":"23","author":"Arru\u00e9","year":"1999"},{"key":"b4-jns131105","series-title":"Neurosurgery","doi-asserted-by":"publisher","first-page":"179","DOI":"10.1227\/00006123-199308000-00001","article-title":"Mixed vascular malformations of the brain: clinical and pathogenetic considerations","volume":"33","author":"Awad","year":"1993"},{"key":"b5-jns131105","series-title":"Acta Neurochir (Wien)","doi-asserted-by":"publisher","first-page":"100","DOI":"10.1007\/BF01400882","article-title":"Cavernous angiomas of the internal auditory canal. 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