{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,22]],"date-time":"2026-07-22T18:59:21Z","timestamp":1784746761117,"version":"3.55.0"},"reference-count":29,"publisher":"Wiley","issue":"8","license":[{"start":{"date-parts":[[2024,3,22]],"date-time":"2024-03-22T00:00:00Z","timestamp":1711065600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Veterinary Surgery"],"published-print":{"date-parts":[[2024,11]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objective<\/jats:title><jats:p>To describe the approach for placement of a transcerebellar fourth ventriculoperitoneal shunt for management of presumed fourth ventricle arachnoid diverticulum and secondary obstructive hydrocephalus of a dog. To describe the outcome of this procedure.<\/jats:p><\/jats:sec><jats:sec><jats:title>Study design<\/jats:title><jats:p>Case report.<\/jats:p><\/jats:sec><jats:sec><jats:title>Animals<\/jats:title><jats:p>Male entire English springer spaniel, 3\u2009years 9 months of age.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>The dog was initially presented for management of acute, progressive, and multifocal brainstem and forebrain dysfunction. Magnetic resonance imaging revealed internal obstructive hypertensive hydrocephalus. The dog was managed via ventriculoperitoneal shunting from the left lateral ventricle and made an excellent recovery. The dog acutely deteriorated 18\u2009months after initial discharge and follow\u2010up magnetic resonance imaging confirmed the ventricular shunt remained in situ with normal\u2010sized lateral ventricles but revealed a cystlike lesion within the fourth ventricle, presumed to be a fourth ventricle arachnoid diverticulum. The diverticulum was causing mass effect and resultant compression of adjacent neuroparenchyma. A second ventriculoperitoneal shunt was subsequently placed into the fourth ventricle via the caudal cranial fossa and cerebellum. This was attached to a three\u2010way connector, to which the existing shunt (within the left lateral ventricle) was also attached, and then secured to the existing medium\u2010pressure valve.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Postoperatively, the dog immediately developed mild vestibular\u2010cerebellar ataxia, with a marked improvement after 3\u2009months. There were no shunt\u2010associated complications. Long\u2010term follow up at 40 months after the second surgical procedure revealed a normal neurological examination.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Transcerebellar ventriculoperitoneal shunt placement for treatment of a presumed fourth ventricle arachnoid diverticulum was performed and was associated with a favorable long\u2010term outcome.<\/jats:p><\/jats:sec>","DOI":"10.1111\/vsu.14090","type":"journal-article","created":{"date-parts":[[2024,3,23]],"date-time":"2024-03-23T04:11:10Z","timestamp":1711167070000},"page":"1430-1437","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Transcerebellar ventriculoperitoneal shunt for management of presumed arachnoid diverticulum in the fourth ventricle of a dog"],"prefix":"10.1111","volume":"53","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0509-247X","authenticated-orcid":false,"given":"Sophie","family":"Wyatt","sequence":"first","affiliation":[{"name":"Royal Veterinary College  Hatfield UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joe","family":"Fenn","sequence":"additional","affiliation":[{"name":"Royal Veterinary College  Hatfield UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elsa","family":"Beltran","sequence":"additional","affiliation":[{"name":"Royal Veterinary College  Hatfield 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