Tracheal obstruction from a malignant growth--secondary or primary?
D000328:Adult; D000402:Airway Obstruction / Q000209:etiology*; D002294:Carcinoma, Squamous Cell / Q000150:complications* / Q000556:secondary; D004938:Esophageal Neoplasms; D006801:Humans; D008297:Male; D014134:Tracheal Neoplasms / Q000150:complications* / Q000556:secondary