A cyst located adjacent to the renal pelvis and may obstruct urine flow is called

A cyst located adjacent to the renal pelvis and may obstruct urine flow is called

• A. Parapelvic cysts
• B. Peripelvic cysts
• C. Renal parenchyma
• D. Renin

Answer: (B)

Understanding cysts near the kidney depends on where they sit in relation to the collecting system. A peripelvic cyst sits around the renal pelvis inside the renal sinus. Because it lies directly against the pelvis, a large peripelvic cyst can push on the collecting system and obstruct urine drainage. On ultrasound you’d see a simple, anechoic cavity in the renal sinus that does not communicate with the calyces, helping differentiate it from hydronephrosis. Parapelvic cysts are also near the pelvis but originate differently and lie more in the hilum projecting into the sinus, whereas renin is a hormone and renal parenchyma is tissue, not a cyst.

Understanding cysts near the kidney depends on where they sit in relation to the collecting system. A peripelvic cyst sits around the renal pelvis inside the renal sinus. Because it lies directly against the pelvis, a large peripelvic cyst can push on the collecting system and obstruct urine drainage. On ultrasound you’d see a simple, anechoic cavity in the renal sinus that does not communicate with the calyces, helping differentiate it from hydronephrosis. Parapelvic cysts are also near the pelvis but originate differently and lie more in the hilum projecting into the sinus, whereas renin is a hormone and renal parenchyma is tissue, not a cyst.