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Renal tumors are represented by mesoblastic nephroma (renal hamartoma) and Wilm’s tumor
(nephroblastoma). Mesoblastic nephroma is the most frequent renal tumor, while Wilm’s tumor is
extremely rare. The sonographic picture in both tumors is of a solitary mass replacing the normal
architecture of the kidney, in most cases with associated polyhydramnios. Cystic areas may appear in
both
tumors. Mesoblastic nephromas are benign, and nephrectomy is curative in the
majority of cases.
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