Benign metastasizing leiomyoma： report of two cases and literature review

Benign metastasizing leiomyoma （BML） is a rare entity, which was initially described by Steiner in 1939, and is now used to describe the presence of cytologically bland and mitotically inactive smooth muscle tumors in extrauterine sites in conjunction with simultaneously appearing or previously removed leiomyomas during myomectomy or hysterectomy.2 Some researchers have reported cases of the disease, focusing on the symptoms, treatments and outcomes of individual cases. Awonuga et al3 suggested the pathogenesis of BML based on over 150 cases in the Medline/PubMed database from January 1966 to October 2008. However,