A CASE OF ADENOCARCINOMA ARISING FROM ABERRANT PANCREATIC TISSUE IN THE STOMACH

A 50-year-old woman was seen at the hospital because of abdominal pain before meals. Closed examination of the stomach revealed a submucosal tumor on the greater curvature at the gastric antrum. Biopsy was performed twice, but the findings were Group 1 in both instances. At laparotomy, a rather hard tumor about 2cm in size was found on the anterior wall of the gastric antrum, and it was resected with a 1cm margin. The surgical specimen showed a small indentation in the antral mucosa, and a hard tumor (1.8×1.0×0.8cm) with a grayish white cut surface in the submucosa. Histological examination revealed acinar cells and Heinrich type II aberrant pancreatic tissue in the submucosa. Part of this tissue showed marked growth of atypical cells surrounded by tubular structures, with infiltration of the muscle layer. Adenocarcinoma arising from aberrant pancreatic tissue was diagnosed from these findings, and distal gastrectomy with R2 lymph node dissection was performed. There has been no sign of recurrence after 27 months of follow-up.