肺平滑肌瘤是较为常见的肺部良性肿瘤 ,根据其部位可分为支气管内型、肺血管内型及肺实质型。本例报告属肺实质型平滑肌瘤(图 1)。临床资料 :患者 ,女 39岁 ,胸闷、咳嗽半月。经胸透检查摄胸部正侧位片示 :右肺中叶内侧段一直径约为5ｃｍ的圆形阴影 ,密度均匀 ,边缘光滑锐利。? Pulmonary leiomyoma is a relatively common benign lung tumor. According to its location, it can be divided into endobronchial, pulmonary endovascular and lung parenchymal type. This case reports a lung parenchymal leiomyoma (Figure 1). Clinical data: Patient, female 39 years old, chest tightness, cough for half a month. Transthoracic chest radiographs showed that the medial segment of the right middle lobe of the right lung was a circular shadow with a diameter of approximately 5 cm, with uniform density and smooth edges. ?