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Fig. 1D. —50-year-old man with bronchial carcinoma of right upper lobe bronchus and tumor infiltration of right main bronchus and intermediate bronchus from lateral bronchial wall (arrows). Tumor occludes upper lobe bronchus. This figure illustrates so-called "multiview mode," in which workstation screen is split into four quadrants. Coronal reformatted CT image offers best anatomic orientation in this case because it shows tracheal bifurcation, intermediate bronchus, and occluded upper lobe bronchus (arrow) in one image.