目的:总结薄层CT对肺内孤立性结节病灶的误诊原因与鉴别诊断的价值。材料和方法;薄层CT扫描89例直径4cm以下肺内孤立结节病灶,所有病例均经病理检验证实。结果周围性肺癌的边缘常是不规则的,伴有分叶、棘状突起和向外生长的毛刺。空洞或小泡较常见,钙化则罕见。但少数良性结节也有分叶,棘状突起和毛刺。 Objective: To summarize the causes and differential diagnosis of misdiagnosis of solitary pulmonary nodules by TLC. Materials and methods; 89 cases of pulmonary nodular lesions with diameter less than 4 cm were scanned by thin-layer CT, all cases were confirmed by pathological examination. Results The edge of peripheral lung cancer is often irregular, with lobes, spines and outward growth of the burr. Empty or small bubbles are more common, calcification is rare. But a few benign nodules also have lobulation, spines and burr.