Congenital Abnormalities of the Kidney and Ureter n Let us have a review of the normal anatomy of the urinary system before having a knowledge of the congenital abnormalitiesRenal pelvisUreteropelvic junction Ureter Renal papilla Minor renal calix Renal parenchyma Renal calix Major renal calix Duplication of the renal pelvis and ureterDuplication of a renal pelvisn Commonn Usually unilateral DuplicationDuplication of a ureterThe ureters usually join before they reach the bladderLess commonly the