<unk>  is swelling and irritation (inflammation) of the area  between the lungs (mediastinum). This area contains the heart, large  blood vessels, windpipe (trachea), esophagus, thymus gland, lymph nodes,  and connective tissues.
Mediastinitis
Tonsilitis
Tonsillitis
Bronchitis
Tracheitis
Lung abscess
Tracheal diverticulum
Croup