Figure

Multilocular cyst (or multilocular cystic nephroma) of the right kidney, detected by ultrasonography (A) and contrast-enhanced CT-scan (B). Both techniques show the characteristic septa (arrow) dividing the mass into multiple sonolucent locules. This rare disorder is usually a benign tumor, though some lesions have been found to contain foci of nephroblastoma or renal clear cell carcinoma. The imaging appearance is actually indistinguishable from those of the cystic forms of Wilms' tumor and renal clear cell carcinoma. (Courtesy of A. Dardenne.)

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