In Type C (IIIB) tracheoesophageal fistula, which description best fits the anatomy?

In Type C (IIIB) tracheoesophageal fistula, which description best fits the anatomy?

• A. Esophagus forms a continuous fistula with the trachea
• B. Only the upper esophagus connects to the trachea
• C. Esophagus ends in a pouch; lower esophagus connects to the trachea near the carina
• D. There is no connection between the esophagus and trachea

Answer: (C)

The key idea is the common pattern of esophageal atresia with a distal tracheoesophageal fistula. In this Type C (IIIB) variant, the upper esophagus ends in a blind pouch, while the lower esophageal segment forms a fistula that connects to the trachea, typically near the carina. This configuration is exactly described by “Esophagus ends in a pouch; lower esophagus connects to the trachea near the carina.” It explains why feeds can regurgitate into the airway and why ventilation can cause air to pass into the stomach through the fistula.

The key idea is the common pattern of esophageal atresia with a distal tracheoesophageal fistula. In this Type C (IIIB) variant, the upper esophagus ends in a blind pouch, while the lower esophageal segment forms a fistula that connects to the trachea, typically near the carina. This configuration is exactly described by “Esophagus ends in a pouch; lower esophagus connects to the trachea near the carina.” It explains why feeds can regurgitate into the airway and why ventilation can cause air to pass into the stomach through the fistula.