among these benign lesions are : simple renal cysts , polycystic kidneys , congenital variations in renal size and shape , segmental renal hypertrophy , renal infarcts , intrarenal hematomas , renal hamartomas , renal leiomyomas , renal adenomas , renal angiomas , renal fibrolipomatosis , hydronephrosis of a duplicated collecting system , renal abscesses , and xanthogranulomatous pyelonephritis .
C0022680
polycystic kidneys
C0022646
renal