Adenocarcinoma arising from a heterotopic pancreas in the first portion of the duodenum: a case report

Background Heterotopic pancreas (HP) is defined as pancreatic tissue in organs with no anatomical continuity with the orthotopic pancreas. Based on the number of cases reported in the literature between the year 2000 and 2020, HP is rarely found causing malignant transformation of the duodenum. We herein report a case of adenocarcinoma arising from the HP in the first portion of the duodenum. Case presentation A 77-year-old Japanese man...