Renal leiomyoma

A renal leiomyoma is a benign tumour of the kidney. It is made of smooth muscle tissue. They can occur both in the renal cortex (outer part) and medulla (inner part) of the kidney. They usually have a distinct capsule and rarely have cystic or calcified portions. They can grow in size anywhere from 0.5cm up to 57cm.Most people experience no symptoms of a renal leiomyoma and it is discovered incidentally during examinations for another reason.