Tracheobronchomegaly (Mounier-Kuhn syndrome) is a rare condition characterized by an abnormally enlarged trachea and main bronchi. Herein, we present a case of 79-year-old male with idiopathic pulmonary fibrosis and acute hypoxemic respiratory failure due to multilobar pneumonia. Computed tomography of the chest demonstrated a markedly dilated trachea, with the transverse diameter of 31mm and the sagittal diameter of 30mm. The clinical manifestations as well as its diagnosis, classification, and treatment are discussed.
