Adenocarcinoma of the colon or rectum, or both.
**can arise from polyps in the colon or rectal region.
--Diagnosis is determined by detecting melena (blood in stool) and by colonoscopy.
--Prognosis depends on the stage (extent of spread) of the tumor, including size, depth of invasion, and involvement of lymph nodes.
- -excision of a major section of colon with rejoining of the cut ends (anastomosis)
- -chemotherapy and radiotherapy are administered as needed.