TABLE 1.

Tracheal stenosis grading systems

Grading system	Stage I	Stage II	Stage III	Stage IV
McCaffrey	Subglottic or tracheal lesions <1 cm	Subglottic lesions >1 cm within cricoid ring and not extending to the glottis or trachea	Subglottic stenosis that extend into the upper trachea but does not involve the glottis	Glottic lesions with fixation/paralysis of the vocal cords
Meyers‐Cotton	Tracheal obstruction diameter: 0%−50%	Tracheal obstruction diameter: 51%–70%	Tracheal obstruction diameter: 71%–99%	No detectable lumen