Intraluminal thyroid tissue, however, may occur anywhere between the glottis and the tracheal bifurcation. The overlying mucosa is usually intact, but there may be evidence of chronic irritation.

extends from the laryngopharynx at the level of the cricoid cartilage at the top to the carina (also called the tracheal bifurcation). C-shaped cartilage rings reinforce and protect the trachea to ...