Subsequent studies have shown a smooth tracheal lining of normal caliber. Ectopic thyroid tissue located within the trachea may cause airway obstruction. If the diagnosis of intratracheal goiter ...

The air that enters the nasal cavity flows down the trachea. The trachea has a number of adaptations: cartilage rings in the walls of the trachea help to keep it open ciliated epithelium and ...

Squamous cells are flat, skin like cells that cover the lining of the mouth, nose, larynx, thyroid, and throat. This type of cancer can spread to lymph nodes in the neck. Some of the most common head ...