Primary Leiomyoma of the Liver: Case Report and Review of the Literature.

Primary leiomyoma of the liver is an extremely rare benign hepatic tumor in asymptomatic patients. While leiomyoma is frequently found in the genitourinary tract, to the best of our knowledge only 29 cases of primary hepatic leiomyoma have been reported in the English language medical literature. Primary hepatic leiomyoma in patients without an underlying systemic disease (immunosuppression) is even more uncommon. A leiomyoma is composed of bundles of smooth muscle fibers and rarely transforms into a malignant tumor. We present a previously healthy 44-year-old woman who was incidentally found to have a focal liver lesion while undergoing radiologic studies for evaluation of her low back pain. The primary leiomyoma of the liver has characteristic radiologic findings that distinguish it from other hepatic tumors. In this article we discuss the typical radiologic and pathologic findings of leiomyoma compared with other primary liver tumors.