Colon cancer. Coloured scanning electron micrograph (SEM) of carcinoma cancer cells from the human colon (large intestine). Colon carcinoma arises in the epithelial cells lining the large intestine. These large malignant tumour cells have a rough surface due to abnormal cytoplasmic projections. They are also displaying typically chaotic and uncontrolled cancerous growth. Cancer of the colon is one of the most common cancers, especially in Western countries. Symptoms include blood in the faeces, constipation or diarrhoea, and abdominal pain. Treatment often involves surgery and the use of anti-cancer drugs. Magnification: x4,150 at 6x7cm size.

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