Synchronous multiple primary cancers of the stomach and duodenum in aged patients: report of two cases.

We describe herein the cases of two aged patients found to have synchronous multiple primary cancers of the stomach and duodenum. The first patient was an 82-year-old man who was preoperatively diagnosed as having gastric cancer after presenting with signs of pyloric stenosis. At laparotomy, duodenal cancer was incidentally found to have infiltrated the transverse colon. A pancreatoduodenectomy and right hemicolectomy with radical lymph node dissection was performed. Two early well-differentiated adenocarcinomas of the stomach and an advanced poorly differentiated adenocarcinoma of the duodenum were confirmed. This patient is now well without any evidence of recurrence more than 5 years after surgery. The second patient was a 77-year-old man who was also diagnosed as having gastric cancer after presenting with signs of pyloric stenosis. Preoperatively, duodenal cancer was detected by endoscopy. A pancreatoduodenectomy and partial colectomy with radical lymph node dissection was performed because the duodenal cancer was suspected of having infiltrated the transverse colon. An early moderately differentiated adenocarcinoma of the stomach and an advanced moderately differentiated adenocarcinoma of the duodenum were confirmed, but the duodenal cancer was not seen to invade the transverse colon microscopically. This patient died of cancer 7 months after surgery. Because multiple primary cancers commonly develop in elderly patients, a precise preoperative diagnosis must be made and optimal treatment applied.