FIGURE 116.24 A: Bilateral Wilms tumor A 5-year-old girl with left flank mass Computed tomography (CT) sections of the upper abdomen with contrast medium enhancement show a necrotic mass arising from superior aspect of the left kidney Note a small mass in the superior medial aspect of the right kidney B: Bilateral Wilms tumor (same patient as in A ) CT section of the abdomen with contrast medium enhancement shows extent of the large necrotic left Wilms tumor with periaortic adenopathy