Anatomic Classification of the Kidney Collecting System for Endourologic Procedures

This study was made on 140 polyester endocasts of the kidney collecting system. The pelvicaliceal endocasts were divided into four types according to the drainage of the polar regions and of the mid (hilar) zone. The types AI and AII (62% of the specimens) presented two major caliceal groups as a primary division of the renal pelvis and mid-zone drainage dependent on these two major groups. The types BI and BII (38% of the specimens) presented mid-zone drainage independent of the superior and inferior caliceal groups.