[Diagnosis of a non-functioning kidney pelvis in adults: a report on 12 cases (author's transl)].

Two types of non-functioning supernumerary kidney pelvis are defined by analyzing 12 cases discovered in adult life. Those of congenital origin from glomerular aplasia, sometimes associated with a ureterocele or an ectopic anastomosis, and those due to an acquired lesion such as lithiasis, vesico-ureteral reflux, or secondary infection of a pocket of fluid. Radiological diagnosis is made by IVU with descending cystography and films taken during micturition. Cystoscopy and possibly retrograde ureteropyelography are essential in order to confirm the diagnosis.