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MERCURY experience
MRI “good prognosis tumours”
If a radiologists calls all patients with <5mm spread node negative, the pre-
test probability for the node negative status to be correct is 82%, the risk of
local recurrence for patients with path node positive in patients mrTR3b or
less, mrCRM clear and EMVI negative is 0% . For the whole MRI “good
prognosis” group – risk is 3.3%
Therefore overcalling nodes in patients with low risk features results in
overtreatment and more harm than benefit.