{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,8,29]],"date-time":"2025-08-29T00:03:33Z","timestamp":1756425813329,"version":"3.44.0"},"reference-count":9,"publisher":"BMJ","issue":"4","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Rep"],"accepted":{"date-parts":[[2025,3,23]]},"published-print":{"date-parts":[[2025,4]]},"abstract":"<jats:p>Medulloblastoma is the most common paediatric tumour presenting in the posterior fossa. Typically, they are found midline and intra-axially located. Medulloblastomas presenting in an extra-axial location, however, are rare, and of those, they are usually found in the cerebellopontine angle. We present a case of an extra-axial medulloblastoma projecting from the lateral cerebellar hemisphere. As far as we know, there have only been two other cases of a paediatric extra-axial medulloblastoma in the cerebellar hemisphere reported in the literature. After initial medical stabilisation and insertion of an external ventricular drain, further imaging was obtained. MRI demonstrated a heterogeneously enhancing mass with diffusion restriction, a dural tail and a CSF cleft in the left lateral cerebellar hemisphere. A far lateral craniotomy was performed, with the tumour being encountered immediately on dural opening and a defined cleavage plane seen between the tumour and the cerebellar hemisphere. Gross total resection was achieved, and after a short recovery period, adjuvant craniospinal irradiation plus chemotherapy is started. This case illustrates an exceptionally rare location of a relatively common paediatric malignant brain tumour.<\/jats:p>","DOI":"10.1136\/bcr-2024-263710","type":"journal-article","created":{"date-parts":[[2025,4,8]],"date-time":"2025-04-08T16:30:20Z","timestamp":1744129820000},"page":"e263710","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Paediatric extra-axial medulloblastoma presenting with obstructive hydrocephalus and tonsillar herniation: clinical presentation and treatment challenges"],"prefix":"10.1136","volume":"18","author":[{"given":"Linyi","family":"Zhu","sequence":"first","affiliation":[{"name":"Medical School, The University of Adelaide, Adelaide, South Australia, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Amer","family":"Helal","sequence":"additional","affiliation":[{"name":"Royal Adelaide Hospital, Adelaide, South Australia, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xenia","family":"Doorenbosch","sequence":"additional","affiliation":[{"name":"Paediatric Neurosurgery, Women's and Children\u2019s Hospital Adelaide, North Adelaide, South Australia, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2025,4,8]]},"reference":[{"key":"2025082802191479000_18.4.e263710.1","doi-asserted-by":"crossref","first-page":"365","DOI":"10.1016\/j.radcr.2018.01.007","article-title":"Posterior fossa medulloblastoma in an atypical extra-axial location: A case report","volume":"13","author":"Presutto","year":"2018","journal-title":"Radiol Case Rep"},{"key":"2025082802191479000_18.4.e263710.2","doi-asserted-by":"publisher","DOI":"10.1177\/0883073815600866"},{"key":"2025082802191479000_18.4.e263710.3","doi-asserted-by":"crossref","first-page":"362","DOI":"10.3340\/jkns.2014.55.6.362","article-title":"Extra-axial medulloblastoma in the cerebellar hemisphere","volume":"PMCID","author":"Chung","year":"2014","journal-title":"J Korean Neurosurg Soc"},{"key":"2025082802191479000_18.4.e263710.4","doi-asserted-by":"crossref","first-page":"45","DOI":"10.4103\/1793-5482.131077","article-title":"Atypical medulloblastoma: A case series","volume":"9","author":"Meshkini","year":"2014","journal-title":"Asian J Neurosurg"},{"key":"2025082802191479000_18.4.e263710.5","doi-asserted-by":"crossref","DOI":"10.1186\/s13244-021-00981-z","article-title":"Posterior fossa extra-axial variations of medulloblastoma: a pictorial review as a primer for radiologists","volume":"12","author":"Al-Sharydah","year":"2021","journal-title":"Insights Imaging"},{"key":"2025082802191479000_18.4.e263710.6","doi-asserted-by":"crossref","first-page":"839","DOI":"10.1007\/s00381-016-3325-6","article-title":"Cerebellopontine angle medulloblastoma with extensive nodularity in a child: case report and review of the literature","volume":"33","author":"Noiphithak","year":"2017","journal-title":"Childs Nerv Syst"},{"key":"2025082802191479000_18.4.e263710.7","doi-asserted-by":"crossref","first-page":"2","DOI":"10.4172\/2155-9929.1000284","article-title":"Medulloblastoma of the Cerebellopontine Angle in a Child: A Case Report and Review of the Literature","volume":"07","author":"Boukobza","year":"2016","journal-title":"J Mol Biomark Diagn"},{"key":"2025082802191479000_18.4.e263710.8","doi-asserted-by":"publisher","DOI":"10.1016\/j.jocn.2019.06.013"},{"key":"2025082802191479000_18.4.e263710.9","doi-asserted-by":"publisher","DOI":"10.1007\/s00401-012-0958-8"}],"container-title":["BMJ Case Reports"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/syndication.highwire.org\/content\/doi\/10.1136\/bcr-2024-263710","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,8,28]],"date-time":"2025-08-28T09:19:25Z","timestamp":1756372765000},"score":1,"resource":{"primary":{"URL":"https:\/\/casereports.bmj.com\/lookup\/doi\/10.1136\/bcr-2024-263710"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,4]]},"references-count":9,"journal-issue":{"issue":"4","published-online":{"date-parts":[[2025,4,8]]},"published-print":{"date-parts":[[2025,4]]}},"alternative-id":["10.1136\/bcr-2024-263710"],"URL":"https:\/\/doi.org\/10.1136\/bcr-2024-263710","relation":{},"ISSN":["1757-790X"],"issn-type":[{"type":"electronic","value":"1757-790X"}],"subject":[],"published":{"date-parts":[[2025,4]]}}}