been called incidentalomas - benign lesions that may be interpreted as a cancer and put patients at potential risk by undergoing follow-up procedures. References Further reading External links NHS cancer screening programmes Screening for cancer, Cancer Research UK Cancer screening overview, National Cancer Institute Cancer Screening at eMedicine ColonCancerCheck including fact sheets in 24 languages at Ontario Ministry of Health and Long-Term Care How screening recommendations have changed over time from the American Cancer Society