Screening tests selectively find slowly-developing cases which have a long presymptomatic phase. For example, fast-growing tumours will be missed by screening and have a worse prognosis. Survival will be better in cases detected by screening without there necessarily being a real difference between the survival of screened and unscreened populations.
Annotations allow you to add information to this page that would be handy to have on hand during a consultation. E.g. a website or number. This information will always show when you visit this page.