title: Intracranial intra-arachnoid cyst with intracystic hemorrhage in two dogs.
abstract: Clinical signs, magnetic resonance imaging (MRI) features, treatment, and outcome of two adult dogs with neurologic dysfunction resulting from hemorrhage into a quadrigeminal intracranial intra-arachnoid cyst are described. In dog 1, the cyst was hyperintense to cerebrospinal fluid (CSF) on T1-weighted MRI and hypointense to CSF on T2-weighted images. In dog 2, the cyst was isointense to CSF on T1- and T2-weighted images. Both dogs were treated with craniotomy and cyst fenestration. A large blood clot was removed from the lumen of the cyst in each dog. Dog 1 is clinically normal 3.5 years post-surgery and has a persistent cyst. Dog 2 had a good initial response to therapy but was euthanized 2.5 years post-operatively due to generalized seizures. The late onset of clinical signs in these dogs most likely resulted from hemorrhage into the cyst. Surgical fenestration and hematoma removal appear to provide a satisfactory treatment for adult dogs with an intracranial intra-arachnoid cyst and intracystic hemorrhage. Persistence of the cyst may occur in some dogs.
authors.affiliation: Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California-Davis, 95616, USA.
authors.forename: Karen M
authors.initials: KM
authors.lastname: Vernau
authors.forename: Richard A
authors.initials: RA
authors.lastname: LeCouteur
authors.forename: Beverly K
authors.initials: BK
authors.lastname: Sturges
authors.forename: Valerie
authors.initials: V
authors.lastname: Samii
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Higgins
authors.forename: Philip D
authors.initials: PD
authors.lastname: Koblik
authors.forename: William
authors.initials: W
authors.lastname: Vernau
mesh_terms: D000818:Animals; D016080:Arachnoid Cysts / Q000150:complications / Q000473:pathology / Q000662:veterinary*; D003937:Diagnosis, Differential; D004283:Dog Diseases / Q000473:pathology* / Q000601:surgery; D004285:Dogs; D020300:Intracranial Hemorrhages / Q000150:complications / Q000473:pathology / Q000662:veterinary*; D008279:Magnetic Resonance Imaging / Q000662:veterinary; D008297:Male; D020335:Paraparesis / Q000209:etiology / Q000662:veterinary