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Fig. 1A. —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. Virtual bronchoscopic CT view down right main bronchus shows grade 1 stenosis caused by tumor occluding right upper lobe bronchus (arrow) growing into main and intermediate bronchi.