Which procedure allows visualization of the entire length of the colon?

Which procedure allows visualization of the entire length of the colon?

• A. Proctoscopy
• B. Enteroscopy
• C. Colonoscopy
• D. Sigmoidoscopy

Answer: (C)

Visualizing the entire length of the colon requires a procedure that can be advanced through the whole large intestine from the anus to the cecum. This is achieved with a colonoscopy, a flexible endoscope inserted through the anus and guided all the way through the colon. It provides direct viewing of the entire colon lining and allows biopsies or removal of polyps during the same session. Other options focus on different parts: proctoscopy examines only the anal canal and distal rectum, sigmoidoscopy views the rectum through part of the sigmoid colon but not the full length, and enteroscopy targets the small intestine rather than the colon. So colonoscopy is the appropriate choice for seeing the entire colon.

Visualizing the entire length of the colon requires a procedure that can be advanced through the whole large intestine from the anus to the cecum. This is achieved with a colonoscopy, a flexible endoscope inserted through the anus and guided all the way through the colon. It provides direct viewing of the entire colon lining and allows biopsies or removal of polyps during the same session. Other options focus on different parts: proctoscopy examines only the anal canal and distal rectum, sigmoidoscopy views the rectum through part of the sigmoid colon but not the full length, and enteroscopy targets the small intestine rather than the colon. So colonoscopy is the appropriate choice for seeing the entire colon.