[Case of benign metastaxsizing leiomyoma of the lungs]

A 51-year-old woman with bilateral multiple pulmonary metastases of uterine leiomyoma was reported. The patient had undergone a hysterectomy for uterine myoma in 1976. In 1981, routine chest roentgenograms showed three nodular lesions in the right lung with well-defined margins. The patient received no treatment because she was asymptomatic. In January 1993, she consulted a gynecologist because of acute lower abdominal pain and an abdominal mass, and bilateral pulmonary tumors were found. The retroperitoneal solid tumor was extirpated in the first operation, and histological findings showed that it was a benign leiomyoma. The pulmonary tumors, extirpated in the second operation, were benign leiomyoma, also. The clinical course and histological findings suggested that this was a case of benign metastasizing leiomyoma. This disease is rare, 21 case have been reported in Japan.