Fig. 5

Renal tumors. Case 1. Mesoblastic nephroma. Axial CECT (a) and fat-saturated T1-weighted image after i.v. contrast medium administration (b) show a solid, focal renal mass replacing the normal right renal parenchyma (block arrows) in this newborn boy. Case 2. Nephroblastomatosis with bilateral Wilms’ tumors. Axial CECT (c) shows the well-defined bilateral renal masses (stars) in this 3-month-old baby, corresponding to a histologically proven bilateral Wilms’ tumor in a child with areas of nephroblastomatosis. The masses remain hypodense compared with normal renal parenchyma. Wilms’ tumors are very rare in fetuses and neonates. Case 3. MCN. T2-HASTE MR image (d) shows a multilocular cystic mass in the right kidney with tumor septae. Observe a similar but smaller left renal lesion (white arrow) in this 10-week-old boy with multiple congenital tumors (same patient as in Fig. 6c)