[Ureteral stenosis of appendicular origin, observations apropos of the value of imaging].

A 73-old man undergoes exploration for right nephrotic colic. IVP demonstrates a dilatation of the upper tract up to the iliac vessels. Extensive exploration is not able to precise the cause of the extrinsic stenosis. At the operation, a subacute appendicitis perforated in the retroperitoneum is assessed. The contribution of new imaging techniques to the aetiologic diagnosis of ureteric stenoses is discussed.