孤立性肺结节(solitary pulmonary nodule,SPN)是指肺实质内单发的、直径≤3 cm的圆形或类圆形结节,不伴有明显的肺不张、卫星病灶或局部淋巴结肿大[1]。SPN的早期正确诊断和鉴别诊断,对于早期合理治疗、改善预后极为重要。因为,早期肺癌手术切除后的5年生存率高达90%以上,而中 Solitary pulmonary nodules (solitary pulmonary nodules, SPN) is a single round or round nodules of ≤3 cm diameter in the lung parenchyma without obvious atelectasis, satellite lesions or local lymph nodes Big [1]. The early correct diagnosis and differential diagnosis of SPN are very important to improve the prognosis for early reasonable treatment. Because, 5 years after resection of early lung cancer survival rate as high as 90%, while in