Metastasis to the colon from primary bronchogenic carcinoma presenting as occult gastrointestinal bleeding--report of a case.

A case of colonic metastasis in a 69-year old man detected due to positive fecal blood tests is presented. Histologic and clinical findings suggested bronchogenic small cell carcinoma as the primary tumor. Metastatic involvement of the colon is an unusual feature of primary bronchogenic carcinoma which is rarely recognized during lifetime.