title: Transitional cell carcinoma forming a perirenal cyst in a cat.
abstract: An eight-year-old, neutered male Burmese cat presented with five days vomiting and anorexia. Physical examination, clinical pathology and diagnostic imaging findings suggested a perirenal pseudocyst. After partial resection of the perirenal capsule clinical signs temporarily resolved, but the cat was euthanased 34 days postoperatively as a result of seizures and recurrence of vomiting. Postoperative histopathology showed neoplastic transitional cells within and lining the resected perirenal capsule; a diagnosis of transitional cell carcinoma was confirmed post-mortem. To the authors' knowledge, this is the first report of this presentation of transitional cell carcinoma. Transitional cell carcinoma should be a differential diagnosis for the aetiology of perirenal pseudocyst.
authors.affiliation: Small Animal Teaching Hospital, University of Liverpool, Leahurst, Chester High Road, Neston, Cheshire CH64 7TE, UK.
authors.forename: E
authors.initials: E
authors.lastname: Raffan
authors.forename: A
authors.initials: A
authors.lastname: Kipar
authors.forename: P J
authors.initials: PJ
authors.lastname: Barber
authors.forename: A I
authors.initials: AI
authors.lastname: Freeman
mesh_terms: D000818:Animals; D002295:Carcinoma, Transitional Cell / Q000175:diagnosis / Q000473:pathology / Q000601:surgery / Q000662:veterinary*; D002371:Cat Diseases / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D002415:Cats; D003560:Cysts / Q000175:diagnosis / Q000473:pathology / Q000601:surgery / Q000662:veterinary*; D017809:Fatal Outcome; D007680:Kidney Neoplasms / Q000175:diagnosis / Q000473:pathology / Q000601:surgery / Q000662:veterinary*; D008297:Male; D009364:Neoplasm Recurrence, Local