anoscopy
(ay-NOS-koh-pee)
A procedure in which a short, lighted tube called an anoscope is inserted into the anus and lower part of the rectum to check for abnormal areas. The anoscope may be used with a special magnifying instrument called a colposcope and a weak acetic acid solution to make abnormal tissue easier to see. Tissue samples may be removed so they can be checked under a microscope for signs of disease. An anoscopy may be used to help diagnose cancers of the anus or rectum. It may also be used to diagnose other conditions, such as hemorrhoids, anal fissures (tears), and anal polyps.