[Aberrant renal papilla. Description of a new sign and review of the literature].

The aberrant renal papilla or papillary invagination is an uncommon congenital anomaly which, because of its radiological appearance, should be included in the differential diagnosis of processes associated with filling defects in the renal pelvis. Its halo of radiolucency and its longitudinal striae, its solid echogenicity and a possible associated vascular anomaly (angiodysplasia) should constitute the basis of the diagnosis. An ultrasonographic evaluation, conducted every 6 to 12 months can constitute, as in the case presented here, a form of follow-up avoiding the need for radical therapy.