Eight children forming an uncommon subgroup of renal obstructive dysplasia are presented. Each child had a nonfunctioning dysplastic kidney with a single collecting system with ectopic ureteral insertion and/or ureterocele. Five of the children had classic multicystic dysplastic kidneys, one had they hdyronephrotic type of multicystic dysplasia kidney had two had hypoplastic kidneys. Other significant medical problems in 5 of the 8 children (63%Z) included VACTERL association, congenital heart diseaise and other genitourinary malformations. Unlike some children with unilateral multicystic dysplasia kidney, this subgroup of children ahs an increased risk of infection. The must be correctly identified on imaging so that tailored clinical management decisions can be made and associated anomalies detected
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