“…The most frequent clinical symptoms in UAD are airway obstruction, epistaxis, rhinorrhea, pain, and swelling of the soft tissue 5,8. When EMP occurs in the trachea, dyspnea is the most common symptom and becomes more severe when the tracheal lumen is narrowed by >75% 9,10. In our case, airway obstruction was the only clinical manifestation before diagnosis, although the laryngopharynx and oropharynx showed swelling of the mucosa, which was found accidentally in the subsequent examination.…”