肺内孤立性结节(so1 itary pu lm onary nodu le,SPN)是指肺实质内单发、圆形或类圆形、边界清晰、最大直径不超过3 cm的高密度影,是临床经常碰到的问题,明确诊断困难,误诊、误治率极高[1],随着多层螺旋CT的逐渐普及和应用,孤立性肺结节的一系列影像学特征得以较清楚的显示。现 Pulmonary solitary nodules (so1 itary pu lm on nodule, SPN) refers to the lung parenchyma single, round or oval, clear boundary, the maximum diameter of not more than 3 cm of high density, is often clinically touched To a clear diagnosis of difficulties, misdiagnosis, mistreatment rate is extremely high [1], with the gradual popularization and application of multi-slice spiral CT, a series of imaging features of solitary pulmonary nodules can be more clearly demonstrated. Now