Almost a million breast screening appointments have been missed in the UK due to the COVID-19 pandemic, according to a charity.
The charity have also estimated that around 8,600 women could be living with undetected breast cancer.
Breast screening services were temporarily paused to free up emergency NHS resources as well as trying to help reduce the spread of coronavirus.
Breast Cancer Now have said it "is a grave concern" that nearly one million women will be caught in the backlog which will lead to further delays in diagnosis, adding that services have resumed at different speeds around the country.
The charity has called on the NHS and government to set out how they plan to tackle an anticipated rise in demand for imaging and diagnostics.
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Baroness Delyth Morgan, chief executive at Breast Cancer Now, said: "Mammograms are a key tool in the early detection of breast cancer, which is critical to stopping women dying from the disease.