<unk>  is a common medical<unk> dure in which an instrument called a<unk>  (also known as a rectoscope, although the latter may be a bit longer) is used to examine the anal cavity, rectum, or sigmoid colon. A<unk>  is a short, straight, rigid, hollow metal tube, and usually has a small light bulb mounted at the end. It is approximately 5 inches or 15 cm long, while a rectoscope is approximately 10 inches or 25 cm long. During<unk> , the<unk>  is lubricated and inserted into the rectum, and then the obturator is removed, allowing an unobstructed view of the interior of the rectal cavity. This<unk> dure is normally done to inspect for hemorrhoids or rectal polyps and might be mildly uncomfortable as the<unk>  is inserted further into the rectum. Modern fibre-optic<unk> s allow more extensive observation with less discomfort.
Proctoscopy
Vaginoscopy
Pouchoscopy
Anoscopy
Fetoscopy
Endoanal ultrasound
Sigmoidoscopy
Vaginogram