Computed tomography (CT) was performed on renal tumors (Wilms' tumor a
nd renal cell carcinoma) and renal cysts in dogs and cats. CT images i
n renal tumors were well correlated with macroscopic findings, and con
trast CT images were quite useful in differentiating tumoral regions f
rom non-tumoral ones. On renal cysts, intravenous pyelography and ultr
asonography were as effective as CT images in morphological diagnosis,
but Cr was considered to be superior for evaluating three-dimensional
(3-D) relationships in complicated lesions.