A<unk>  is a tumor primarily presenting in the<unk>  It may be benign or malignant. 80% of all<unk> s are malignant. Among these, the most common are the squamous-cell carcinoma and the adenoid cystic carcinoma.
Tracheal tumor
Mediastinal tumors
Mediastinitis
Tracheitis
Tracheoinnominate fistula
Pancoast tumor
Tracheal deviation
Lung abscess