Proctoscopy

Definition of proctoscopy
National Cancer Institute

proctoscopy

(prok-TOS-koh-pee)
A procedure that uses a proctoscope to look inside the anus and rectum. A proctoscope is a thin, tube-like instrument with a light and a lens for viewing. It may also have a tool to remove tissue to be checked under a microscope for signs of disease.

Source: NCI Dictionary of Cancer Terms