{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,8]],"date-time":"2026-07-08T00:20:20Z","timestamp":1783470020555,"version":"3.55.0"},"reference-count":18,"publisher":"Journal of Neurosurgery Publishing Group (JNSPG)","issue":"1","license":[{"start":{"date-parts":[[2026,7,6]],"date-time":"2026-07-06T00:00:00Z","timestamp":1783296000000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Neurosurg Case Lessons"],"published-print":{"date-parts":[[2026,7,6]]},"abstract":"<jats:sec>\n                    <jats:title>BACKGROUND<\/jats:title>\n                    <jats:p>Oculomotor nerve schwannomas are rare intracranial tumors, particularly in adolescents. When associated with intralesional hemorrhage, they may radiologically mimic completely thrombosed aneurysms of the posterior circulation, creating diagnostic and operative challenges.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>OBSERVATIONS<\/jats:title>\n                    <jats:p>A 15-year-old girl presented with progressive headache and acute partial left third nerve palsy. MRI demonstrated a heterogeneous hemorrhagic mass in the left interpeduncular cistern closely abutting the superior cerebellar artery\u2013posterior cerebral artery complex. MRA revealed no aneurysm. Two months later, the patient developed complete third nerve palsy, and repeat MRI showed lesion enlargement with subacute hemorrhage. Digital subtraction angiography excluded aneurysm. Resection via an orbitozygomatic approach revealed a lesion arising from the oculomotor nerve without vascular origin. Histopathological analysis confirmed schwannoma (WHO grade 1) with Antoni A and B areas and diffuse S100 positivity. At the 3-month follow-up, third nerve function showed minimal recovery.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>LESSONS<\/jats:title>\n                    <jats:p>Hemorrhagic oculomotor schwannoma may closely mimic a completely thrombosed aneurysm in the basilar apex region. Multimodal vascular imaging, recognition of nerve continuity, and radiologic-pathological correlation are essential for accurate diagnosis and operative planning.<\/jats:p>\n                    <jats:p>\n                      <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" xlink:href=\"https:\/\/thejns.org\/doi\/10.3171\/CASE26215\">https:\/\/thejns.org\/doi\/10.3171\/CASE26215<\/jats:ext-link>\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.3171\/case26215","type":"journal-article","created":{"date-parts":[[2026,7,1]],"date-time":"2026-07-01T00:16:35Z","timestamp":1782864995000},"source":"Crossref","is-referenced-by-count":0,"title":["Hemorrhagic oculomotor nerve schwannoma mimicking a completely thrombosed posterior circulation aneurysm in an adolescent: illustrative case"],"prefix":"10.3171","volume":"12","author":[{"given":"Tinh Thanh","family":"Truong","sequence":"first","affiliation":[{"name":"Department of Neurosurgery, Faculty of Medicine, University of Medicine and Pharmacy at Ho Chi Minh City"},{"name":"Department of Neurosurgery, University Medical Center Ho Chi Minh City, Vietnam"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hoa Viet","family":"Nguyen","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Faculty of Medicine, University of Medicine and Pharmacy at Ho Chi Minh City"},{"name":"Department of Neurosurgery, University Medical Center Ho Chi Minh City, Vietnam"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1754","reference":[{"issue":"5","key":"bib1","series-title":"J Neurosurg","first-page":"1037","article-title":"Acute third cranial nerve palsy from a third cranial nerve schwannoma presenting as a saccular aneurysm on three-dimensional computed tomography angiography: case illustration","volume":"108","author":"Chewning","year":"2008","unstructured":"Chewning RHSasson ADJordan LCTamargo RJGailloud P.Acute third cranial nerve palsy from a third cranial nerve schwannoma presenting as a saccular aneurysm on three-dimensional computed tomography angiography: case illustration. J Neurosurg. 2008;108(5):1037. doi:10.3171\/JNS\/2008\/108\/5\/1037"},{"issue":"1","key":"bib2","series-title":"Egypt J Neurol Psychiatry Neurosurg","first-page":"27","article-title":"Cisternal oculomotor schwannoma: a rare cause of anisocoria with ptosis in a child","volume":"58","author":"Parashar","year":"2022","unstructured":"Parashar VMathur V.Cisternal oculomotor schwannoma: a rare cause of anisocoria with ptosis in a child. Egypt J Neurol Psychiatry Neurosurg. 2022;58(1):27. doi:10.1186\/s41983-021-00438-6"},{"key":"bib3","series-title":"Surg Neurol Int","first-page":"40","article-title":"Management of oculomotor nerve schwannoma: systematic review of literature and illustrative case","volume":"10","author":"Muhammad","year":"2019","unstructured":"Muhammad SNiemel\u00e4 M.Management of oculomotor nerve schwannoma: systematic review of literature and illustrative case. Surg Neurol Int. 2019;10:40. doi:10.25259\/SNI-75-2019"},{"issue":"9","key":"bib4","series-title":"Cureus","first-page":"e10183","article-title":"Hemorrhagic vestibular schwannoma: case report and literature review of incidence and risk factors","volume":"12","author":"Shahbazi","year":"2020","unstructured":"Shahbazi TSabahi MArjipour MAdada BBorghei-Razavi H.Hemorrhagic vestibular schwannoma: case report and literature review of incidence and risk factors. Cureus. 2020;12(9):e10183. doi:10.7759\/cureus.10183"},{"key":"bib5","series-title":"Front Oncol","first-page":"1097155","article-title":"Hemorrhagic schwannoma of the trochlear nerve: case report and a review of the literature","volume":"12","author":"Lei","year":"2023","unstructured":"Lei JLi YWan XHemorrhagic schwannoma of the trochlear nerve: case report and a review of the literature. Front Oncol. 2023;12:1097155. doi:10.3389\/fonc.2022.1097155"},{"issue":"12","key":"bib6","series-title":"BMJ Case Rep","first-page":"e262958","article-title":"Isolated cisternal third cranial nerve schwannoma: an insight into a clinico-radiological features","volume":"17","author":"Parida","year":"2024","unstructured":"Parida SSachdeva VWarkad VU.Isolated cisternal third cranial nerve schwannoma: an insight into a clinico-radiological features. BMJ Case Rep. 2024;17(12):e262958. doi:10.1136\/bcr-2024-262958"},{"issue":"8","key":"bib7","series-title":"BMJ Case Rep","first-page":"e230272","article-title":"Oculomotor schwannoma causing a progressive complete third-nerve palsy","volume":"12","author":"Bentley","year":"2019","unstructured":"Bentley EVed RHayhurst C.Oculomotor schwannoma causing a progressive complete third-nerve palsy. BMJ Case Rep. 2019;12(8):e230272. doi:10.1136\/bcr-2019-230272"},{"issue":"4","key":"bib8","series-title":"Surv Ophthalmol","first-page":"1160","article-title":"Oculomotor nerve schwannoma: case series and literature review","volume":"67","author":"Douglas","year":"2022","unstructured":"Douglas VPFlores CDouglas KAStrominger MBKasper ETorun N.Oculomotor nerve schwannoma: case series and literature review. Surv Ophthalmol. 2022;67(4):1160-1174. doi:10.1016\/j.survophthal.2021.11.008"},{"issue":"5-6","key":"bib9","series-title":"World Neurosurg","first-page":"798","article-title":"Surgical management of nonvascular lesions around the oculomotor nerve","volume":"81","author":"Nonaka","year":"2014","unstructured":"Nonaka YFukushima TFriedman AHKolb LEBulsara KR.Surgical management of nonvascular lesions around the oculomotor nerve. World Neurosurg. 2014;81(5-6):798-809. doi:10.1016\/j.wneu.2012.11.067"},{"issue":"5","key":"bib1","series-title":"J Neurosurg","first-page":"1037","article-title":"Acute third cranial nerve palsy from a third cranial nerve schwannoma presenting as a saccular aneurysm on three-dimensional computed tomography angiography: case illustration","volume":"108","author":"Chewning","year":"2008","unstructured":"Chewning RHSasson ADJordan LCTamargo RJGailloud P.Acute third cranial nerve palsy from a third cranial nerve schwannoma presenting as a saccular aneurysm on three-dimensional computed tomography angiography: case illustration. J Neurosurg. 2008;108(5):1037. doi:10.3171\/JNS\/2008\/108\/5\/1037"},{"issue":"1","key":"bib2","series-title":"Egypt J Neurol Psychiatry Neurosurg","first-page":"27","article-title":"Cisternal oculomotor schwannoma: a rare cause of anisocoria with ptosis in a child","volume":"58","author":"Parashar","year":"2022","unstructured":"Parashar VMathur V.Cisternal oculomotor schwannoma: a rare cause of anisocoria with ptosis in a child. Egypt J Neurol Psychiatry Neurosurg. 2022;58(1):27. doi:10.1186\/s41983-021-00438-6"},{"key":"bib3","series-title":"Surg Neurol Int","first-page":"40","article-title":"Management of oculomotor nerve schwannoma: systematic review of literature and illustrative case","volume":"10","author":"Muhammad","year":"2019","unstructured":"Muhammad SNiemel\u00e4 M.Management of oculomotor nerve schwannoma: systematic review of literature and illustrative case. Surg Neurol Int. 2019;10:40. doi:10.25259\/SNI-75-2019"},{"issue":"9","key":"bib4","series-title":"Cureus","first-page":"e10183","article-title":"Hemorrhagic vestibular schwannoma: case report and literature review of incidence and risk factors","volume":"12","author":"Shahbazi","year":"2020","unstructured":"Shahbazi TSabahi MArjipour MAdada BBorghei-Razavi H.Hemorrhagic vestibular schwannoma: case report and literature review of incidence and risk factors. Cureus. 2020;12(9):e10183. doi:10.7759\/cureus.10183"},{"key":"bib5","series-title":"Front Oncol","first-page":"1097155","article-title":"Hemorrhagic schwannoma of the trochlear nerve: case report and a review of the literature","volume":"12","author":"Lei","year":"2023","unstructured":"Lei JLi YWan XHemorrhagic schwannoma of the trochlear nerve: case report and a review of the literature. Front Oncol. 2023;12:1097155. doi:10.3389\/fonc.2022.1097155"},{"issue":"12","key":"bib6","series-title":"BMJ Case Rep","first-page":"e262958","article-title":"Isolated cisternal third cranial nerve schwannoma: an insight into a clinico-radiological features","volume":"17","author":"Parida","year":"2024","unstructured":"Parida SSachdeva VWarkad VU.Isolated cisternal third cranial nerve schwannoma: an insight into a clinico-radiological features. BMJ Case Rep. 2024;17(12):e262958. doi:10.1136\/bcr-2024-262958"},{"issue":"8","key":"bib7","series-title":"BMJ Case Rep","first-page":"e230272","article-title":"Oculomotor schwannoma causing a progressive complete third-nerve palsy","volume":"12","author":"Bentley","year":"2019","unstructured":"Bentley EVed RHayhurst C.Oculomotor schwannoma causing a progressive complete third-nerve palsy. BMJ Case Rep. 2019;12(8):e230272. doi:10.1136\/bcr-2019-230272"},{"issue":"4","key":"bib8","series-title":"Surv Ophthalmol","first-page":"1160","article-title":"Oculomotor nerve schwannoma: case series and literature review","volume":"67","author":"Douglas","year":"2022","unstructured":"Douglas VPFlores CDouglas KAStrominger MBKasper ETorun N.Oculomotor nerve schwannoma: case series and literature review. Surv Ophthalmol. 2022;67(4):1160-1174. doi:10.1016\/j.survophthal.2021.11.008"},{"issue":"5-6","key":"bib9","series-title":"World Neurosurg","first-page":"798","article-title":"Surgical management of nonvascular lesions around the oculomotor nerve","volume":"81","author":"Nonaka","year":"2014","unstructured":"Nonaka YFukushima TFriedman AHKolb LEBulsara KR.Surgical management of nonvascular lesions around the oculomotor nerve. World Neurosurg. 2014;81(5-6):798-809. doi:10.1016\/j.wneu.2012.11.067"}],"container-title":["Journal of Neurosurgery: Case Lessons"],"original-title":[],"link":[{"URL":"https:\/\/thejns.org\/view\/journals\/j-neurosurg-case-lessons\/12\/1\/article-CASE26215.xml","content-type":"text\/html","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/thejns.org\/downloadpdf\/journals\/j-neurosurg-case-lessons\/12\/1\/article-CASE26215.xml","content-type":"text\/html","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/thejns.org\/downloadpdf\/journals\/j-neurosurg-case-lessons\/12\/1\/article-CASE26215.xml","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,7,8]],"date-time":"2026-07-08T00:01:15Z","timestamp":1783468875000},"score":1,"resource":{"primary":{"URL":"https:\/\/thejns.org\/view\/journals\/j-neurosurg-case-lessons\/12\/1\/article-CASE26215.xml"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,7,6]]},"references-count":18,"journal-issue":{"issue":"1"},"URL":"https:\/\/doi.org\/10.3171\/case26215","relation":{},"ISSN":["2694-1902"],"issn-type":[{"value":"2694-1902","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,7,6]]}}}