Colorectal tumors begin as small growths (polyps) on the inside of the large intestine. Polyps that aren't removed eventually can become cancerous, break through the wall of the colon or rectum, and spread to other areas.
Crohn's Disease
Rectal tumors or cancers
Infections:
Syphilis lesions or ulcers
Tuberculous ulceration ...
: Low-dose aspirin and incidence of colorectal tumors in a randomized trial. J Natl Cancer Inst 85 (15): 1220-4, 1993.
Stürmer T, Glynn RJ, Lee IM, et al.
Radiation therapy, although not usually considered effective by itself, may be used in addition to surgery for treating rectal tumors.
Adenocarcinomas account for the vast majority of rectal tumors in the United States.[5] Rare tumors, including carcinoid tumors, lymphomas, and neuroendocrine tumors, account for less than 3% of colorectal tumors.[5] ...
More than 80% of colorectal tumors evolve from adenomatous polyp s. These gland-like growths develop on the mucous membrane that lines the large intestine. They are usually one of the following types: ...
biological therapy, which can help your immune system fight cancer or help lessen side effects from other cancer treatments
radiation therapy, which uses X-rays or other high-energy rays to kill cancer cells and shrink rectal tumors ...
Brachytherapy can be used for the treatment of many different types of cancers for example HDR Prostate Brachytherapy for cancer in the prostate gland, brachytherapy for breasts, lung, esophageal and gynecologic cancers, anal and rectal tumors, ...
 See also: Cancer, Colorectal Cancer, Rectal cancer, Symptom, Surgery
  
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