Chest CT Airway Dz compared betw GPA (n26) & relapsing polychondritis (n19). Subglottic involvement favors GPA (OR 28.6) & Extensive airway Dz favor of RP (GP OR 0.02). Lesser RP assoc w/ Posterior tracheal sparing & tracheal calcifications. https://t.co/TaaEjpPm76 https://t.co/mwljLYIymH