Tracheoesophageal fistula
A tracheoesophageal fistula is a connection (fistula) between the esophagus and the trachea. It is commonly seen with esophageal atresia. Congenitally it occurs because the tracheoesphageal ridges fail to fuse. Additionally, fistulas are made artificially in patients who have undergone a laryngectomy, as this can serve as way for generating sound in replacement of the removed voice box.