Perirenal urinoma secondary to prostatic obstruction.

We report a case of perirenal urinoma secondary to benign prostatic hypertrophy. This rare complication of bladder outlet obstruction was due to subsequent hydronephrosis and increased pressure in the renal cavities, leading to rupture of caliceal fornix and allowing perirenal extravasation of urine. Complete resolution of the urinoma was obtained with bladder decompression and conservative management.