A cyst located beside the renal pelvis that can obstruct the kidney is called

A cyst located beside the renal pelvis that can obstruct the kidney is called

• A. Parapelvic cysts
• B. Peripelvic cysts
• C. Renal sinus lipomatosis
• D. Renin

Answer: (A)

The key idea is that a cyst situated right next to the renal pelvis can block urine flow by externally compressing the pelvis and collecting system. These are parapelvic cysts, which lie in the renal hilum adjacent to the pelvis. Because of their location, they can cause obstruction of the kidney and may mimic hydronephrosis on imaging. In contrast, renal sinus lipomatosis is fatty change in the renal sinus, not a cyst, and renin is a hormone, not a cyst. Peripelvic cysts are nearby as well but their behavior and appearance differ; the scenario described most fits parapelvic cysts.

The key idea is that a cyst situated right next to the renal pelvis can block urine flow by externally compressing the pelvis and collecting system. These are parapelvic cysts, which lie in the renal hilum adjacent to the pelvis. Because of their location, they can cause obstruction of the kidney and may mimic hydronephrosis on imaging. In contrast, renal sinus lipomatosis is fatty change in the renal sinus, not a cyst, and renin is a hormone, not a cyst. Peripelvic cysts are nearby as well but their behavior and appearance differ; the scenario described most fits parapelvic cysts.