The ultrasound spectrum of prune-belly syndrome.

The sonographic features of prune-belly syndrome are illustrated and described, corresponding to a classification based on clinical and radiographic findings. The severity of urinary tract involvement determines to which group a given patient is assigned. In group I, the kidneys are dysplastic, with no appreciable surrounding renal parenchyma. In group II, there is marked dilatation of the ureter and mild dilatation or no dilatation of the renal pelvis and calyces. In group III, the involvement is milder, ranging from the sonographic findings typical of group II to those of normal-appearing urinary tract.