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We report a case of a 15-year-old Moroccan boy, with a perinephric urinoma, whose health had previously been good, but who experienced a sudden onset of right flank pain. Radiological examination: right kidney increased in size, poorly differentiated with bumpy contours with bad rotation, major ureterohydronephrosis laminating the cortex, late contrast extravasation in the perirenal to the pelvis. Double JJ drainage was performed without incident. Urinoma is a rare complication of obstruction of the urinary tract, and it occurs most commonly following renal trauma, in our case we have not found any clear reason to explain the etiology of obstruction and extravasation, but we put etiological assumptions.