[Pyelo-ureteral dilatation revealing appendiceal abscess. Apropos of 2 cases].

The pyelo-ureteral dilatation revealing a appendiceal abscess is a uncommon situation. Its physio-pathological mechanism is not clear. The authors present two cases of which the diagnosis was not immediately made. The appendiceal abscess treatment is usually enough to make disappear the ureteral dilatation and the after effects stenosis are exceptional.