Bilateral congenital hydronephosis was described in a tiger cub; clinically the animal was dull since three days prior to death. Grossly enlargement of both kidneys with abnormal retention of urine in renal pelvis was observed. Slight dilation of renal pelvis, calyces, bulging of renal crest was noticed. In medulla cystic spaces communicated with the pelvis were observed. On detailed examination, stricture was noticed in both ureters. Histopaholgical examination revealed slight atrophy of medulla and cortex. Cystic dilation of renal tubules with atrophy of renal tubular epithelium was evident. The tubules were separated by a diffuse cortical fibrosis. Based on the gross, histopaholgical findings the case was identified as bilateral congenital hydronephrosis.
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