Breast cancer treatment at a Nottinghamshire hospital is to be reviewed as part of an urgent inspection into breast tissue biopsies.
The Care Quality Commission says it wants to look in-depth at the "quality and safety" of the services offered at Kings Mill Hospital, Sutton-in-Ashfield.
Seventy-nine women in total are being recalled with regard to the results of breast cancer testing at the trust.
Twenty-seven women have been seen by specialists since Friday.
The tests concerned are not used to diagnose cancer but to determine which treatment would be most effective once a patient has been diagnosed with breast cancer.
Hospital officials say the fault is due to a technical issue and not medical error.
The Sherwood Forest Hospitals NHS Foundation Trust issued a statement today saying that the problem with the tests has now been rectified
The Trust is currently being investigated for the state of its finances.
Watchdog Monitor has appointed Chris Mellor as interim chairman following the resignation of Tracey Doucet on Thursday.
The Trust apologised to all of the patients affected:
Dr Nabeel Ali, Executive Medical Director stressed that there are no problems with the diagnosis of breast cancer:
Sherwood Forest Trust serves a population of 418,000 across Nottinghamshire as well as parts of Derbyshire and Lincolnshire.
The Trust also runs Newark Hospital.