A malignant neoplasm involving the trachea. The disease is Monarch Disease Ontology entry MONDO_0001407 (tracheal cancer). Also known as: Ca trachea, cancer of trachea, malignant neoplasm of the trachea, malignant neoplasm of trachea, malignant trachea neoplasm, malignant trachea tumor, malignant trachea tumour, malignant tracheal neoplasm.