[Retroperitoneoscopic resection of the calyceal diverticulum wall in an 8-year-old child].

A renal calyceal diverticulum is a cystic cavity within the renal parenchyma, which is lined by transitional epithelium and communicates with the calyx or, more rarely, the renal pelvis. In children, this anomaly is extremely rare. The article describes the resection of the middle calyceal diverticulum in an 8-year-old child using retroperitoneoscopic access.