Hyperplastic polyposis of the colorectum and adenocarcinoma in a 24-year-old man.

Hyperplastic polyps in the large intestine are considered common after the age of 40, devoid of neoplastic transformation capability, and have a well-defined histological picture. Nevertheless, there exists evidence that hyperplastic polyps can present with adenomatous areas, eventually leading to carcinoma. There has been a suggestion in certain cases that a transformational sequence might exist in the genesis of colorectal cancer: hyperplastic polyp-adenoma-adenocarcinoma. Adenocarcinoma resulting from a pure hyperplastic polyp has also been described. These data have generated reconsideration of the significance of hyperplastic polyps in relation to cancer. In this paper we present a 24-year-old man with adenocarcinoma of the colon who underwent a right hemicolectomy. Twenty-eight hyperplastic polyps were found in the surgical specimen. Two of these polyps had adenomatous areas. The patient died 18 months after the surgical resection.