{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,31]],"date-time":"2026-03-31T18:05:35Z","timestamp":1774980335524,"version":"3.50.1"},"reference-count":21,"publisher":"BMJ","issue":"3","license":[{"start":{"date-parts":[[2026,3,31]],"date-time":"2026-03-31T00:00:00Z","timestamp":1774915200000},"content-version":"unspecified","delay-in-days":30,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Rep"],"accepted":{"date-parts":[[2026,3,12]]},"published-print":{"date-parts":[[2026,3]]},"abstract":"<jats:p>We present a case of symptomatic posterior fossa arachnoid cyst (PFAC) that was successfully treated with endoscopic surgery. A woman in her 60s presented with progressive lightheadedness. Brain MRI showed a non-enhancing cystic lesion in the cerebellum that exerted pressure on the fourth ventricle, causing hydrocephalus, which further exacerbated 6 months later. Considering that PFAC was the cause of the patient\u2019s symptoms, an endoscopic cystoventriculostomy was performed. Postoperatively, the patient\u2019s symptoms improved, and MRI showed reduction of the cyst and improvement of hydrocephalus. Although symptomatic arachnoid cysts are uncommon in adults, endoscopic cystoventriculostomy is a minimally invasive and effective approach, with applicability across a broad spectrum of cases.<\/jats:p>","DOI":"10.1136\/bcr-2025-271209","type":"journal-article","created":{"date-parts":[[2026,3,31]],"date-time":"2026-03-31T17:25:34Z","timestamp":1774977934000},"page":"e271209","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Symptomatic posterior fossa arachnoid cyst treated with endoscopic cystoventriculostomy in an adult"],"prefix":"10.1136","volume":"19","author":[{"given":"Tadahiro","family":"Tsubota","sequence":"first","affiliation":[{"name":"Neurosurgery, University of Fukui, Fukui, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Satoshi","family":"Kawajiri","sequence":"additional","affiliation":[{"name":"Neurosurgery, University of Fukui, Fukui, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hidetaka","family":"Arishima","sequence":"additional","affiliation":[{"name":"University of Fukui, Fukui, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kenichiro","family":"Kikuta","sequence":"additional","affiliation":[{"name":"Neurosurgery, University of Fukui, Fukui, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2026,3,31]]},"reference":[{"key":"2026033110252546000_19.3.e271209.1","doi-asserted-by":"publisher","DOI":"10.3171\/2012.10.JNS12548"},{"key":"2026033110252546000_19.3.e271209.2","doi-asserted-by":"crossref","first-page":"436","DOI":"10.4236\/ojmn.2019.94041","article-title":"Adult Posterior Cranial Fossa Arachnoid Cyst: A Case Report","volume":"09","author":"Berete","year":"2019","journal-title":"OJMN"},{"key":"2026033110252546000_19.3.e271209.3","doi-asserted-by":"crossref","first-page":"275","DOI":"10.3171\/2015.2.PEDS14612","article-title":"Exploring predictors of surgery and comparing operative treatment approaches for pediatric intracranial arachnoid cysts: a case series of 83 patients","volume":"16","author":"Ali","year":"2015","journal-title":"J Neurosurg Pediatr"},{"key":"2026033110252546000_19.3.e271209.4","doi-asserted-by":"crossref","DOI":"10.1016\/j.wnsx.2023.100195","article-title":"Intracranial arachnoid cysts: What is the appropriate surgical technique? 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