Abstract
nine-year-old castrated male Japanese domestic cat presented ap Petite loss and vomiting, as well as palemucose mem'brane and pain in the right renal region. Plain X-ray revealed masses in the caudal part of the thoraciccavity and enlargement of the right kidney.Excretory urography failed to produce contrast images of theright kidney. Right nephrectomy and an incisional biopsy of the intrathoracic masses were conducted on day 10.The cranial side of the right kidney was enlarged, and the intrathoracic masses were blackish and slightlyhard. The right kidney and the intrathoracic masses presented similar histopatholgical features and werediagnosed as hemangiosarcoma (HSA).The cat's condition suddenly deteriorated on day 15 and it died.Necropsy was not conducted according the request of the owner, which hindered identification of the causeand prevented a detailed analysis of the tumor pathology. The cat showed pain in the renal region by palpation, and hematology revealed nonregenerative anemia.A renal HSA should be considered as a diagnosis fora cat presenting with similar clinical signs.
