Figure 15a. Plexiform neurofibroma of the bladder in an 8-year-old girl with café au lait spots and inguinal freckling who presented with hematuria. (a) Sonogram of the bladder shows heterogeneous thickening of the posterior bladder wall (*). (b, c) Intravenous contrast-enhanced CT scans show a low-attenuation mass along the posterior wall of the bladder (* in b). The mass extends into the posterior pelvis and encircles the vagina and rectum (arrows in c).