A treatment apparatus including: a bronchoscope including a flexible shaft having working channel； a transbronchial ablation probe configured to extend from a distal end of the working channel and extend thru a wall of a trachea and into tissue outside of the trachea； and a stabilization element mounted to a distal portion of the flexible shaft, wherein the stabilization element is configured to brace the distal portion against the wall of the trachea while the transbronchial ablation probe is extended through the wall of the trachea.
