An undescribed coexistence of benign metastasizing leiomyoma in the lung with serous borderline tumor of the ovary.

Pulmonary benign metastasizing leiomyoma (BML) is a rare disease occurring predominantly in women of reproductive age and usually develops several years after the resection of a uterine leiomyoma. Serous borderline tumor (SBT) occurs most frequently in the ovary originated from sex hormone dependence. This report describes such a co-existing case. A 46-year-old woman developed a uterine leiomyoma co-existing SBT of the right ovary ten years ago and then underwent abdominal total hysterectomy and right side oophorectomy. In 2008, she developed a co-existing pulmonary BML and SBT of the left ovary. Left side oophorectomy was performed and no further therapeutic actions were taken. The patient is currently alive and well. To the authors' knowledge, this is the first case of a coexisting BML and SBT. Herein, they describe the clinicopathological features of BML and the possible existence of a close causative association between BML and SBT.