[Retroperitoneal fibrosis caused by extensive perirenal hematoma].

We report a case of direct renal trauma with formation of subcapsular hematoma in an anticoagulated patient. After an initial conservative approach, patient condition spontaneously evolved to subcapsular rupture resulting in perirenal spread of the hematoma enveloping the ureter up to the sacral level thus causing severe hydronephrosis. Surgical exploration permitted ureterolysis and postoperative radiologic work up revealed patency. We briefly discuss the current controversy relative to the different therapeutic approaches.