Type C (86.5%): Esophageal atresia with tracheoesophageal fistula, in which the upper segment of the esophagus ends in a blind pouch (EA) and the lower segment of the esophagus is attached to the trachea (TEF).
This defect almost always occurs in conjunction with tracheoesophageal fistula (TEF), a condition in which the esophagus is improperly attached to the trachea, the "windpipe" that carries air into the lungs.
Tracheoesophageal fistula-An abnormal connection between the trachea and esophagus, frequently associated with the esophagus ending in a blind pouch.
In 85 to 90 percent of tracheoesophageal fistulas, the top part of the esophagus ends in a blind sac, and the lower part inserts into the trachea.
Type B (0.8%): Esophageal atresia with tracheoesophageal fistula in which the upper segment of the esophagus forms a fistula to the trachea.