What type of endoscope is used to visualize the lower part of the large intestine?

The sigmoidoscope is specifically designed to visualize the lower part of the large intestine, particularly the sigmoid colon and rectum. This flexible tube-like instrument allows healthcare providers to perform examinations and diagnostic procedures to assess conditions such as inflammation, polyps, and other abnormalities in the lower gastrointestinal tract.

While other types of endoscopes serve different purposes—such as the gastroscope for examining the stomach and the bronchoscope for the lungs—the sigmoidoscope's design is tailored to the specific anatomy and needs of the lower intestinal region. The colonoscope also examines the large intestine but extends further into the colon than a sigmoidoscope, making it a different tool altogether. Therefore, the sigmoidoscope is the correct choice for visualizing the lower part of the large intestine.