Introduction: There are multiple studies about the developmental variations of the arterial and venous system of the kidneys. However, the description of developmental variations of the excretory system are not abundantly present in the literature. Material and Methods: The structure of the renal excretory system was studied by means of macroscopic dissection on 90 kidneys. Results: Intrarenal pelvis (type I) when the pelvis is completely located inside the sinus, closed by the parenchyma was encountered in 45 specimens, which corresponds to 50% of cases. The extrarenal pelvis that is located outside the sinus and is not covered by the renal parenchyma was encountered in 9 specimens (10% of cases). Extrarenal type of pelvis with an open posterior surface, when, the posterior surface of the pelvis is free from the parenchyma and the anterior one is covered by the groove of the kidney was encountered in 18 specimens (20% of cases). The mixed type, in which the pelvis is located partly inside the sinus, partly outside of it, was encountered in 16 specimens (17.78% of cases). A special type of pelvis, when the pelvis as such is anatomically absent, and two elongated large calyces, connect and form the ureter was found in 2 cases (2.22%). Pearson correlation analysis demonstrated that calyces’ lengths correlated best when there were two calyces (r=0.51; p[removed]