A<unk>  <unk> , or<unk> ; see spelling differences) is an abnormal connection (fistula) between the esophagus and the trachea.<unk>  is a common congenital abnormality, but when occurring late in life is usually the sequela of surgical procedures such as a laryngectomy.
Tracheoesophageal fistula
Tracheoinnominate fistula
Laryngotracheal stenosis
Subglottic stenosis
Tracheal deviation
Aortoesophageal fistula
Tracheomalacia
Laryngomalacia