A 48 year old Japanese man who had recently immigrated to the United States was seen by his local physician for fatigue,weight loss,and "feeling full all the time".Endoscopy revealed a polypoid tumour mass with "heaped up" edges.A biopsy was performed,and a representative section is shown in the accompanying photomicrograph.Which one of the following is the best diagnosis?

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Japanese men have a much higher incidence of gastric adenocarcinoma than American men.The symptoms in the clinical vignette are classic for this disorder.The histological appearance is of infiltrating glandular structures,consisting of intestinal-type glands.Signet ring carcinoma has a more diffuse pattern,with infiltration by single "signet ring" cells,which have a characteristic microscopic appearancE

A 48 Year Old Japanese Man Who Had Recently Immigrated