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Extramural vascular invasion is an adverse prognostic indicator of survival in patients with colorectal cancer

Background/aims  Extramural vascular invasion (EVI) in colorectal cancer is reported to be a stage‐independent adverse prognostic factor, and is a core item in the Royal College of Pathologists minimum data set for colorectal cancer histopathology reporting. The detection of EVI is also highly variable amongst pathologists. Our aims were to analyse both the frequency of EVI in colorectal cancer resections, and the effect of EVI on survival, in patients operated on over a 5‐year period.