Results of US study in 30 children with various renal lesions are reported, and compared with clinical and surgical features. Different ultrasonographic aspects are discussed with special interest on cogenital abnormalities. US is proposed as first choice investigation in newborns with antenatal ultrasonographic demonstration of renal lesions and in all patients where a mass of renal origin is suspected. Renal function, nevertheless, must be investigated with radiologic and/or radioisotopic techniques. US have still a large indication in short term follow-up of renal lesions where surgical treatment is not indicated.
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