Esophagus tissue
Bergmann (1958) and others first reported such deformities, also known as solid intramural tracheolbronchial rests in the esophagus or choristomas. Both the esophagus and the trachea develop from the embryo's foregut, and they are a common tubular organ at the third week of the embryo. During the separation of the trachea from the esophagus at the sixth week, the esophagus wall is trapped with tracheal cartilage, Contains mucus glands, mostly in the lower esophagus.
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