Kidney size in children with unilateral urinary duplication

Absolute kidney length and the ratio of right to left kidney lengths were estimated by the method of Eklöf & Ringertz in a series of 142 patients with unilateral renal duplication. The anomalous kidney was frequently found to be larger than the contralateral one, particularly when associated with ectopic ureterocele, which was present in 34 patients. Nevertheless, a substantial number of reduplicated kidneys had a length below mean, some of them actually below -2SD.