NONINVASIVE BOTRYOID EXTENSION OF WILMS-TUMOR INTO THE BLADDER

We present the previously unreported CT appearance of a Wilms' tumor w hich extended down the ureter and protruded into the bladder as a botr yoid mass, The tumor apparently arose from an intralobar nephrogenic r est and demonstrated local invasion into renal sinus vessels and papil lae, There was no tumor invasion into the wall of the ureter or bladde r, and therefore, the extension into the ureter and bladder did not up stage the tumor. This report adds to the list of differential diagnose s of a botryoid bladder mass in a child and demonstrates yet another u nusual manifestation of Wilms' tumor.