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Bone metaplasia in rectal polyp. About the case.

Bone metaplasia consists of the histological formation of benign bone tissue. It has been described in numerous tissues, but rarely in gastrointestinal tissue. In most cases it is asymptomatic and its finding incidental. Its production mechanism is not well known and there are several theories formulated to date. We present the case of a 77-year-old asymptomatic man, who was resected at colonoscopy a rectal polyp with findings of bone metaplasia on the pathology report.