title: Quadrigeminal arachnoid cysts in a kitten and a dog.
abstract: Two quadrigeminal arachnoid cysts with different pathogenesis are described in 2 different species. A 10-week-old male Persian kitten with a progressively decreasing level of consciousness died spontaneously. At necropsy, mild internal hydrocephalus, caudal cerebellar coning, and cerebellar herniation through the foramen magnum were associated with a congenital quadrigeminal arachnoid cyst compressing the rostral cerebellum and shifting the entire cerebellum caudally. In contrast, a possibly acquired quadrigeminal cyst was observed in a 2-year-old male neutered Yorkshire Terrier in association with necrotizing encephalitis. Quadrigeminal arachnoid cysts have been rarely reported in dogs and humans.
authors.affiliation: Department of Pathobiological Sciences, Louisiana State University School of Veterinary Medicine, Baton Rouge, LA 70803, USA. dzdreed@gmail.com
authors.forename: Scott
authors.initials: S
authors.lastname: Reed
authors.forename: Doo Youn
authors.initials: DY
authors.lastname: Cho
authors.forename: Dan
authors.initials: D
authors.lastname: Paulsen
mesh_terms: D000818:Animals; D016080:Arachnoid Cysts / Q000473:pathology / Q000662:veterinary*; D001344:Autopsy / Q000662:veterinary; D002371:Cat Diseases / Q000473:pathology*; D002415:Cats; D002528:Cerebellar Neoplasms / Q000473:pathology / Q000662:veterinary*; D004283:Dog Diseases / Q000473:pathology*; D004285:Dogs; D017809:Fatal Outcome; D004684:Leukoencephalitis, Acute Hemorrhagic / Q000150:complications / Q000473:pathology / Q000662:veterinary; D008297:Male; D008578:Meninges / Q000473:pathology*