Concurrent Invasive Ductal Carcinoma and Pancreatic Intraepithelial Neoplasia in Duodenal Heterotopic Pancreas: A Case Report.

Heterotopic pancreatic (HP) tissue is defined as the presence of pancreatic tissue outside of its usual site with no vascular or anatomic association with the normal pancreas. This is most commonly found in the stomach, duodenum, and proximal jejunum. Most HP findings are incidental. Yet, they can occasionally produce symptoms such as bleeding, abdominal pain, and gastrointestinal obstruction symptoms. HP tissues can also become malignant. The following report details a rare case of a 77-year-old man with concurrent invasive ductal carcinoma and low-grade pancreatic intraepithelial neoplasia involving an HP tissue located at the duodenum.