Focal muscular hyperplasia of the trachea.
D006801:Humans; D006965:Hyperplasia / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009130:Muscle, Smooth / Q000473:pathology; D014132:Trachea / Q000473:pathology; D014134:Tracheal Neoplasms / Q000473:pathology / Q000601:surgery