Gastric carcinoma is a common malignancy worldwide. Advanced stages of the disease may result in metastases to many other organs of the body. However, colonic metastases are rare. We report a case of gastric carcinoma with symptoms of abdominal fullness and weight loss. The serum carcinoembryonic antigen level was elevated. Esophagogastroduodenoscopy revealed giant folds occupying the whole gastric body and poor expansion of the stomach. Histologic examination of biopsy specimens from the giant fold demonstrated poorly differentiated adenocarcinoma with signet ring-cell differentiation. Total colonoscopy revealed five or six discrete flat elevated lesions in the distal transverse, descending, and sigmoid colons. These lesions were characterized by a clear margin of 3-5 mm in diameter and erosions on the tips. Polypectomy specimens demonstrated signet ring-cell carcinoma, which was histologically similar to the specimens taken from the gastric lesion. We conclude that this was a rare case in which gastric signet ring-cell carcinoma had metastasized to the colon in the form of flat elevated lesions, combined with rapid and wide lymphatic spread to the thorax and abdomen in a clinical course as short as 46 days.

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