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Fig. 1A. —55-year-old male cadaver. Axial unenhanced T1-weighted MR image (TR/TE, 500/16; excitations, 2) shows horseshoe-shaped healthy trachea. Mucous membrane of trachea (thick arrows) has intermediate signal intensity, posterior membranous portion (curved arrow) has intermediate signal intensity with inwardly concave shape, and tracheal cartilage (arrowheads) has intermediate signal intensity mixed with low signal intensity. Signal intensity of mucous membrane slightly exceeds that of tracheal cartilage and that of posterior membranous portion.