对３１例手术切除病例行ＣＴ与病理对照研究，讨论肺内良性小病灶（＜３．０ｃｍ）的ＣＴ征象及诊断价值；同时研究１６例原发性小肺癌的ＣＴ特点，期望提高肺内小病灶良恶性鉴别诊断水平。１　材料和方法收集近５年内直径小于３ｃｍ肺内良性病灶４６例。男性３０例，女性１６? Thirty-one surgically resected cases were studied by CT and pathology. The CT findings and diagnostic value of benign small lesions (<3.0 cm) in lung were discussed. At the same time, CT features of 16 cases of primary small lung cancer were studied. Differential diagnosis of benign and malignant lesions. 1 Materials and Methods 46 cases of benign lung lesions less than 3 cm in diameter within the past 5 years were collected. 30 males and 16 females