Hematuria due to renal hemangiosarcoma in a donkey

A 22-year-old female donkey was referred for evaluation of gross hematuria, anemia and thrombocytopenia. Renal origin hemorrhage was diagnosed and a l eft nephrectomy performed following blood transfusion. Normal urination was attained after surgery, but the donkey could not be maintained. Necropsy r evealed renal hemangiosarcoma. Although abnormalities were not detected ant emortem, hemangiosarcoma was found in the spleen, liver, mesentery and larg e intestine. Hemangiosarcoma should be considered in the differential diagn osis of hematuria in the donkey, and involvement of other organs should be considered if renal hemangiosarcoma is found.