CT-pathologic Correlation of Tumor-lung Interface in Pulmonary Global Lesions 3 cm or less （Analysis of 50 Cases）

We reviewed CT images of 50 pulmonary global lesions （37 lung cancers and 13 benign nodules） 3 cm or less proved pathologically in this paper. Ill-defined edge of the lung cancers were found in 30 （81％） and that of the benign nodules were in 4 （31％） on thin-section CT images. The number of the spiculations more than 6 of the lung cancers were found in 27 （73％） and that of the benign nodules were in 2 （15％） on a layer CT image. Serrated signs were only seen in 8 lung cancers because of the unequal speed development and infiltration of carcinoma tissue in the pathology. Comparison of CT images with pathologic data suggests that the serrated sign of nodule is a valuable sign in diagnosis of small peripheral lung cancer on CT image. The edge feat ure and number of spiculations of nodule are helpful to differential diagnosis between the malignancy and benignancy of small solitary lung nodules on CT images.