A flexible sigmoidoscopy uses a thin tube to examine and evaluate the sigmoid colon and rectum. The instrument has its own lens and light source.
The sigmoidoscopy is different from a colonoscopy in that, it only allows the physician to see the sigmoid colon (lower one-third). This exam can detect inflamed tissue, ulcers and other abnormal growths. The preparation for this exam, usually requires a laxative and fleet enemas. A colonoscopy remains the “gold standard” for colon cancer screening.