The minor fissure is an important anatomical landmark in the localization of the pulmonary diseases, For the evaluation of the normal feature of the minor fissure, we analyzed the high-resolution computed tomography (CT) scans in 51 normal patients. The purposes of this study are to evaluate the normal appearance of the minor fissure on high-resolution CT scans and to compare it with that on the coventional cT and chest radio-graphs. We analysed the morphologic feature of the minor fissure on the high-resolution CT scans in 51 nor-mal patients, and compared it with that on the conventional CT scans. On the high-resolution CT scans, we particularly paid attention to the completeness and types according to Berkmen classification. And finally, we compared the types determined by the high-resolution CT scans with those by the plain radiographs. In most patients (n=47), the minor fissure was seen as a hyperattenuating line or band on the high-resolution CT scans. In contrast, it was mostly seen as a lucent zone on the conventional CT scans (n=44) Of 47 patients having a hyperattenuating line or band on the high resolution CT scans, the minor fissure was considered to be complete in 17 patients (36%), and incomplete in 30 patients (64%), who had a defect at medial portion of the minor fissure. The most common type of the minor fissure seen on the high-resolution CT scans was type I variety (n=23), followed by type IIa(n=10) and type IIa(n=10) and type II (n=8). We could not determine the type in six patients. The type determined by the high resolution CT scans was highly well correlated with that determined by the plain radiographs (p<0.05). In conclusion, the minor fissure was seen on CT studies as variable appearances and high-resolution CT scans were superior to the conventonal cT scans in the evaluation of the minor fissure, The types of the minor fissure determined by the high-resolution CT scans were well correlated with those seen on the radiographs.