Twenty women have undergone unnecessary mastectomies, while others suffered significant harm while under the care of an NHS trust.
Out of 514 cases reviewed by the County Durham and Darlington Foundation Trust (CDDFT), 315 have been found to have suffered harm, with 77 of them significantly harmed. One patient is known to have died.
The trust has also identified missed or delayed cancer diagnoses that led to some of the patients subsequently seeing their cancer spread.
Denise Howarth, 51, from Consett, County Durham, is one of several women who have been told by the NHS that her mastectomy was unnecessary.
She said: ‘I was just in
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