Missed polyps, missed opportunities.

摘要

Colorectal cancer is the third most common cancer and the second leading cause of cancer death in the United States, with an estimated 141,210 new cases and 49,380 deaths in 2011. Fortunately, colorectal cancer remains highly preventable through several available screening modalities that can lead to the detection and removal of adenomatous polyps. Although more resource intensive and invasive than other established alternatives, colonos-copy is traditionally considered by many to be the most effective screening option. Colonoscopy permits immediate polypectomy and removal of macroscopically abnormal tissue in contrast to tests based on radiographic imaging or detection of occult blood or exfoliated DNA in stool. Colonoscopy also directly visualizes the entire extent of the colon and rectum, including segments of the colon that are beyond the reach of flexible sigmoidoscopy.