Percutaneous drainage of a late-onset giant posttraumatic urinoma.

Received April 2008 Accepted April 2009 INTRODUCTION Urinoma or pararenal pseudocyst is defined as an encapsulated collection of extravasated urine in the perirenal space. Extravasation of urine into the perirenal fat triggers lipolysis and inflammatory reactions, which lead to formation of a fibrous sac around the collected urine.(1) Urinomas occur most commonly following trauma to the kidneys.(1) Although posttraumatic urine extravasation is common (2% to 18%), urinoma develops only in few cases.(2) Other major causes include obstructive uropathy (eg, posterior urethral valve and ureteropelvic junction obstruction), iatrogenesis in endosurgical procedures, and rarely, pregnancy.(3-5) We report a young man with a giant urinoma following falling which had caused left-flank blunt trauma 1 month earlier. Treatment with percutaneous drainage was done successfully.