EXTRARENAL WILMS-TUMOR

Extrarenal Wilms' tumour is rare and its imaging has received scant me ntion in the literature. We describe a 2-year-old boy with a firm mass in the right flank. CT, MRI and ultrasonography showed an inhomogeneo us solid mass located in the retroperitoneum, which was separate from the right kidney. Angiography showed an enlarged right gonadal artery and irregularly tortuous vessels in the tumour similar to intrarenal W ilms' tumour (''spider leg'' or ''creeping vine'' appearance). Histopa thological examination confirmed an extrarenal Wilms' tumour.