Neurofibromatosis can be associated with various malignancies, but an association with adenocarcinoma is extremely rare. A 61-year-old man who had been diagnosed with adenocarcinoma of the hepatic flexure of the colon was referred for segmentally located, multiple café-au-lait spots and tumors on his back and axillary freckles for 40 years. Histopathologic examination of the tumor was consistent with the neurofibromatosis. We report an unusual case of type I neurofibromatosis associated with adenocarcinoma of the colon that was clinically similar to segmental neurofibromatosis.
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