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Types of CAO. (A) Extrinsic compression due to malignant disease outside of the trachea (posteriorly in this case). (B) Intraluminal obstruction secondary to a tracheal tumor within the airway lumen. (C, D) Mixed obstruction, best seen postdebulking (cryoextraction and laser) with endoluminal tumor and left tracheal wall extrinsic compression.
