A giant polyp was found within the proximal jejunum of a 16-year-old-girl that was originally suspected to be a hamartomatous Peutz-Jeghers polyp. Examination revealed a giant polypoid gastric heterotopia containing ectopic thyroid tissue. The presence of gastric heterotopia in the small intestine is well documented. Rare cases of ectopic thyroid tissue in the small intestine have also been reported. Ectopic thyroid tissue arising within a polypoid gastric heterotopia in the small intestine, to our knowledge, has not previously been reported
