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Figure 4. Posteroanterior chest radiographs showing minor fissures in (a) a 67-year-old man and (b) a 54-year-old woman. (a) The minor fissure with shape of convexity upward is visible as one line (arrows). Medial side of it is higher than lateral and its length is more than two-thirds. Focal obliteration of the fissure is seen medially but outside of the pulmonary artery. (b) The minor fissure is seen as two lines running parallel to each other (arrows).

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