[Spontaneous urinary extravasation: report of three cases].

We report three cases of urinary extravasation successfully recovered by conservative measures. Two of them were regarded as spontaneous peripelvic extravasation caused by small ureteral stones. After several days' indwelling ureteral catheter extravasation was ceased and the stones were discharged spontaneously in both cases. The other was regarded as spontaneous rupture of the renal pelvis with urinoma formation due to ureteral obstruction by bladder cancer invasion. Intra-arterial chemotherapy, radiation and hyperthermotherapy to the bladder under percutaneous nephrostomy yielded recanalization of obstructed ureter and resolving of urinoma. We shortly review previous reports and discuss the role of diagnosis and treatment.