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tracheobronchomegaly

n. A rare disease of the lungs and airways where the trachea and bronchi become abnormally wide, leading to sputum collection in the lungs and repeated chest infections and bronchiectasis.

Wikipedia
Tracheobronchomegaly

Mounier-Kuhn syndrome (also called tracheobronchomegaly) is a very rare congenital disorder of the lung primarily characterized by an abnormal widening of the upper airways. The abnormally widened trachea and mainstem bronchi are associated with recurrent lower respiratory tract infection and copious purulent sputum production, eventually leading to bronchiectasis and other respiratory complications.