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Fig. 1B. —Asymptomatic 66-year-old man with tuberculosis in whom lung lesions were incidentally detected at chest radiography. Thin-section CT scans at mediastinal (B) and lung (C) window settings obtained at level of aortic arch show irregular nodule in left upper lobe that is composed of numerous small nodules. Note internal calcification (arrow, B) and air bronchograms (arrowheads, C).