孤立性肺结节(single pulmonary nodule,SPN)是肺部常见病变,是指发生于肺部直径≤3cm的圆形或类圆形肺内病灶,病灶一般无钙化或空洞,不伴有肺不张、卫星病灶和局部淋巴结肿大[1]。孤立性肺结节是肺部病变诊断和鉴别诊断的重点和难点,部分病变仅凭形态学表现难以定性诊断。CT动 Pulmonary nodules (single pulmonary nodules, SPN) is a common disease in the lungs, refers to the diameter of the lungs ≤ 3cm round or round type of intrapulmonary lesions, lesions generally without calcification or empty, not associated with the lungs Zhang, satellite lesions and local lymph nodes [1]. Solitary pulmonary nodules are the focus and difficulty of the diagnosis and differential diagnosis of pulmonary lesions, some of the lesions difficult to qualitative diagnosis based on morphological performance alone. CT move