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The distribution of the amount of the thyroid gland removed surgically and the postsurgical change in tracheal narrowing (n = 65). Tracheal narrowing (degree of upper airway obstruction) is defined as the (CCAT-SCAT)/CCAT ratio, where SCAT is the smallest cross-sectional area of the trachea, and CCAT is the cross-sectional area 2 cm above the carina.
