A Case of Intravenous Leiomyomatosis.

Leiomyoma of the uterus is the most common benign uterine tumor affecting 40-50% of women older than 40 years of age. The pathogenesis of uterine leiomyoma is unknown, but several studies have suggested that each leiomyoma arises from a single neoplastic cell within the smooth muscle of the myometrium. Uterine leiomyoma can be extended outside the uterus growing into the pelvic veins, and in exceptional cases, even into the right side of the heart. Since this was first recognized more than 90 years ago, more than 25 cases of tumor extending into the vessel has been reported, but the pathogenesis and treatment of intravenous leiomyomatosis was not still established. We experienced a case of intravenous leiomyomatosis and report with a brief review of literatures.