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Search from anal cancer photos stock photos, pictures and royalty-free images from istock. Find high-quality stock photos that you wont find anywhere else. anal cancer is an uncommon malignancy that starts in the anus-- the opening at the end of the rectum. What causes anal cancer? Nearly all (90) anal cancers are attributable to persistent infection with hpv, the cause of genital warts. Certain strains of hpv are known to be oncogenic (cancer-causing), especially types hpv 16 and 18, and these two infections cause more than 90 of anal cancers. Rarely, subtyping of hpv has detected low-risk strains such as hpv 6 or multiple strains of hpv. with anal cancer, malignant cells grow in the tissues of the anus. Infection with the human papillomavirus (hpv) increases your risk. A lump near the anus, anal discharge, bleeding, itching, and pressure are signs and symptoms. anal cancer is cancer that arises in the anus, the end of the intestinal tract where stool (feces) exits the body. The cancer can begin either in the lining of the anus or in the skin surrounding the anus. Anal cancer is different from colon or rectal cancer, which arises in the other parts of the large intestine. Risk factors for developing anal cancer include infection with certain types of. other symptoms include anal pressure or pain, masses or growths, itching and discharge. Warning signs do not occur in all individuals who have the disease, and signs of anal cancer are also associated with other medical conditions. At first, most people assume the bleeding is caused by hemorrhoids (painful, swollen veins in the anus and rectum that may bleed). The most recent version of tnm staging of anal cancer is as follows.