What is an esophageal fistula?

A tracheo-esophageal fistula is an abnormal pathway between the trachea (windpipe) and the esophagus (tube that connects the throat with the stomach).

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The esophagus is the tube between the throat and stomach, and a fistula is an abnormal passage between two internal organs so that food can go from the food tube to ___? Could be a real problem.