Abstract
A 78-year-old man underwent distal gastrectomy for gastric cancer on September 2007. Abdominal computed tomography showed a mass lesion near the transverse colon, and CEA increased, thus he was diagnosed as having colonic metastasis of gastric cancer. After chemotherapy was started, the mass lesion became unclear, however tumor markers repeated a pattern of increase and decrease. Symptoms of ileus were shown on January 2012, therefore an operation was performed. As for the operation view, colorectal cancer was suspected, and transverse colon resection was performed. Histological examination revealed adenocarcinoma (tub, pSE, and pN0), CK7+, CK20-, CdX2-, HER2+, which was the same as the primary gastric cancer. Finally it was diagnosed as metastatic colonic cancer of gastric cancer.
