ANATOMY

Detailed explanation-1: -The renal pelvis is occasionally called the pyelum (from Greek pýelos, “trough", ‘anything hollow’), and the combining form pyelo-denotes the renal pelvis (pyelo-is not to be confused with pyo-).

Detailed explanation-2: -An extrarenal pelvis is a normal anatomical variant that is predominantly outside the renal sinus and is larger and more distensible than an intrarenal pelvis that is surrounded by sinus fat. While the exact incidence is not known, it is estimated to be seen in up to 10% of the population 1.

Detailed explanation-3: -renal pelvis, enlarged upper end of the ureter, the tube through which urine flows from the kidney to the urinary bladder.

Detailed explanation-4: -The apex of the renal pelvis extends outwards from the kidney, and becomes continuous with the superior end of the ureter.