目的 探讨肺良性转移性平滑肌 瘤(pulmonary benign metastasizing leiomyoma,PBML)的CT特征，提高对该病 的认识。方法 回顾性分析经病理证实的6 例PBML患者的CT平扫及增强表现，分析病 灶的大小、数目、部位、形态、边缘、内 部结构及增强表现、CT伴随征象等。结果 6例均为女性，有子宫肌瘤手术史。6例CT 表现均是双肺多发散在随机分布结节，双 肺下叶分布为著，结节可为实性结节、薄 壁空洞型结节或结节伴空洞，所有结节边 界清楚，可有分叶，无毛刺，内密度均匀 或伴低密度液化坏死，无钙化及支气管充 气征，增强扫描大部分病灶呈中重度强 化。所有病例均未见纵隔及双肺门淋巴结 肿大、胸腔积液及心包积液。结论 PBML 是一种罕见疾病，多有子宫平滑肌瘤手术 史，CT扫描肺部出现多发边缘清楚的结 节，同时不伴纵隔及双肺门淋巴结肿大、 胸腔积液及心包积液时需考虑PBML的可 能。

Objective To analyze the CT characteristics of pulmonary benign metastasizing leiomyoma (PBML) and improve the recognition of this disease. Methods CT imaging features of 6 patients with PBML confirmed by histopathology were retrospectively reviewed. Imaging findings of the number, location, morphology, size,margin, inner structure and accompanying signs were assessed. Results All cases were female with a history of hysteromyomectomy. The imaging of PBML manifest multiple and welldefined nodules. The distribution was random with a preference of inferior lobes. Nodules may appear as solid, cave with thin-wall or cystic-solid lesions and lobular types could appear on some instances. No burr was seen.Tumors revealed homogeneous or inhomogenous density and showed moderate to intense enhancement after administrating contrast agent while calcification and air bronchogram were rarely seen. Neither the swelling of mediastinum/hilar lymph nodes nor the dropsy of the pericardium/ thorax was presented in any cases. Conclusion PBML is a rare disease with a history of hysteromyomectomy. When multiple well-defined nodules without swelling of the mediastinum/hilar lymph nodes or dropsy of the pericardium/thorax were manifested, a possibility of PBML should be considered .