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Fig. 1B. —Axial, multiplanar, and three-dimensional (3D) CT images of central airways in 57-year-old man with non—small cell lung cancer and bronchoscopically proven airway invasion. Three-dimensional external-rendered CT image of airway shows irregular deformity of distal trachea and carina and severe narrowing of proximal right mainstem bronchus (arrow) with distal patency. Compared with axial images, such as A, 3D perspective provides more accurate assessment of overall extent of airway involvement.