Colon adenocarcinoma represents the third most frequent cause of death by cancer, being surpassed only by lung or stomach cancer.

Commonly occurs in the lower part of the sigmoid colon (rectosigmoid colon) and rectum. The probable diagnosis is usually based on clinical data, which mainly comprise anemia, low digestive tract bleeding, abdominal pain, and weight loss.
Surgical resection may be curative although five-year survival rate is 40-50%.
Most colorectal carcinomas are of soft tissue density that narrow the bowel lumen. Occasionally low-density masses with low-density lymph nodes are seen in mucinous adenocarcinoma, due to the majority of the tumour composed of extracellular mucin.
all cases

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