Heterotopic gastrointestinal cyst of the oral cavity.

We report a heterotopic gastrointestinal cyst of the oral cavity. Heterotopic islands of gastrointestinal mucosa have been found in the esophagus, the small bowel, and particularly in Meckel's diverticulum. However, their occurrence in the head and neck is extremely rare. Previously reported cases and the theories of embryogenesis are reviewed.