A Case Report of Very Well Differentiated Adenocarcinoma of the Colon.

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The patient was a, 49- year -old man. He presented with the chief complaints of left lower abdominal pain, a palpable mass in the same region, and thinning of stool. Colonoscopic examination revealed that a lobulated mass with central depression. under suspicion of colonic cancer a biopsy was taken under direct endscopic control. the biopsy tissue specimens taken at 4 sites were compatible with tubular adenoma but were negative for malignancy. However imaging studies revealed an about 11 cm tumor infiltrating the bladder. As a result, high anterior resection and partial cystectomy were performed. The tissue specimen removed was a tumorous mass measuring 10 by 14 cm. It had a nodular, papillary surface with partial irregularities. Histopathologically, it was found that the tumor tissue formed a relatively orderly duct and showed little cellular atypism, but that the invasion of the tumor was as deep as the subserous layer. Based on these findings a diagnosis of very well differentiated adenocarcinoma was made.