良性转移性平滑肌瘤 (ｂｅｎｉｇｎｍｅｔａｓｔａｓｉｚｉｎｇｌｅｉｏｍｙｏｍａｓ,ＢＭＬ)是一种罕见的、原因不明的疾病。世界上仅有 40余例报告〔1〕。我们于 1999年 9月收治 1例并为其行双肺移植手术 ,术后病人死于肺动脉栓塞 ,尸检病理证实为ＢＭＬ ,现报告如下。病人　 Benignmetastasizing leiomyomas (BML) is a rare, unexplained disease. There are only more than 40 reports in the world [1]. We treated one patient in September 1999 and performed a double-lung transplant. The postoperative patient died of pulmonary embolism. Pathologically confirmed by autopsy as BML, the report is as follows. patient