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Fig. 6A. —66-year-old man with chronic tracheal stenosis after intubation. Three-millimeter collimated CT scan shows tracheal lumen narrowed primarily because of collapse and inward displacement of calcified tracheal cartilage. Lateral tracheal walls are displaced inward, similar to saber-sheath trachea in appearance. Slight thickening of mucosa and submucosa caused by granulation tissue or fibrosis is also visible internal to cartilage. This finding would not be expected in saber-sheath trachea. Expiratory images showed no further tracheal collapse.