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Journal of the American Animal Hospital Association 39:567-572 (2003)
© 2003 American Animal Hospital Association

Case Report

External Hydrocephalus in Two Cats

Curtis W. Dewey, DVM, MS, Diplomate ACVIM (Neurology), Diplomate ACVS, Joan R. Coates, DVM, MS, Diplomate ACVIM (Neurology), Julie M. Ducoté, DVM, Diplomate ACVIM (Neurology), Joseph D. Stefanacci, VMD, Diplomate ACVR, Michael A. Walker, DVM, Diplomate ACVR (Radiology Radiation Oncology) and Dominic J. Marino, DVM, Diplomate ACVS

From the Long Island Veterinary Specialists (Dewey, Stefanacci, Marino), 163 South Service Road, Plainview, New York 11803 and the Departments of Small Animal Medicine and Surgery (Coates, Ducoté) and Large Animal Medicine and Surgery (Walker), College of Veterinary Medicine, Texas A&M University, College Station, Texas 77843-4474.

External hydrocephalus describes an accumulation of cerebrospinal fluid (CSF) between the cerebral hemispheres and the overlying arachnoid membrane, rather than within the lateral ventricles. Two young cats with encephalopathic signs were diagnosed with external hydrocephalus, one via magnetic resonance imaging and one via computed tomography. Both cats had abnormally large, broad heads, with no evidence of open fontanelles. A surgical shunt was placed in each cat to divert the accumulated CSF within the cranial cavity to the peritoneal space. Both cats improved dramatically soon after surgical shunting was performed, and they continue to do well clinically, approximately 42 months and 8 months postoperatively, respectively.






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