bilateral simple renal cystsbilateral peripelvic renal cystsbilateral parapelvic renal cystsbilateral renal cortical cystsbilateral simple cystsbilateral peripelvic cystsbilateral parapelvic cystsbilateral renal hypodensitiesbilateral cystic kidney diseasebilateral renal cystic lesionsbilateral cystic dysplastic kidneysrenal disease