Mucinous cystoadenoma arising from a pancreatic heterotopia: a case report.

Pancreatic heterotopia is occasionally detected as an incidental finding in a diagnostic upper endoscopy. Although, it usually courses as an asymptomatic entity, the same pathological changes found in the normal located pancreas may develop. Mucinous pancreatic cystoadenoma is a premalignant lesion usually located in the body and tail of the pancreas characteristically in women in their fifties and sixties. The definitive diagnosis relies on the presence of a columnar mucin-producing epithelium and an ovarian-type stroma. This type of lesion fulfilling all the criteria and arising from a pancreatic heterotopia has been only reported in two cases. We report the third case of a mucinous pancreatic cystoadenoma arising from a pancreatic heterotopia in a different location than previously reported.