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Colorectal cancer image - Coggle Diagram
Colorectal cancer 
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pathophysiology
Most colorectal cancers start as a growth on the inner lining of the colon or rectum. These growths are called polyps.
Some types of polyps can change into cancer over time (usually many years), but not all polyps become cancer. The chance of a polyp turning into cancer depends on the type of polyp it is
manifestations
Diarrhea, constipation, or feeling that the bowel does not empty completely
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TNM staging system
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Node (N): Has the tumor spread to the lymph nodes? If so, where and how many?
Metastasis (M): Has the cancer spread to other parts of the body? If so, where and how much?
diagnosis
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Blood tests. Because colorectal cancer often bleeds into the large intestine or rectum, people with the disease may become anemic
Colonoscopy. As described in Screening, a colonoscopy allows the doctor to look inside the entire rectum and colon while a patient is sedated
Computed tomography (CT or CAT) scan. A CT scan takes pictures of the inside of the body using x-rays taken from different angles.
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references
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AskMayoExpert. Colorectal cancer: Screening and management (adult). Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2018.
Feldman M, et al. Colorectal cancer. In: Sleisenger and Fordtran's Gastrointestinal and Liver Disease: Pathophysiology, Diagnosis, Management. 10th ed. Philadelphia, Pa.: Saunders Elsevier; 2016. https://www.clinicalkey.com. Accessed Jan. 30, 2019.