Abstract
Small cell undifferentiated carcinoma (oat cell carcinoma) is a malignant epithelial neoplasm with neuroendocrine features. It can appear as a primary tumor in many organs besides the lung, including the colon. We report a case of primary small cell undifferentiated carcinoma of the left colon with omental metastases in a 23-year-old man with a history of X-linked hyper-IgM syndrome. The patient had a simultaneous primary hepatocellular carcinoma. A literature review of this rare colonic malignancy is presented together with a discussion of the possible relationship of this tumor with hepatic malignancy and immunodeficiency.
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