Ontario Premier Dalton McGuinty says it's "horrific" that two women in the Windsor area had their breasts removed unnecessarily.
He says his government owes it to all Ontario women to find out why the mastectomies were performed.
The province has launched an investigation into other potential unnecessary surgeries, but is limiting it to three Windsor-area hospitals despite calls for a wider probe from the Ontario Hospital Association and opposition parties.
Another pathologist at Grey Bruce Health Services was asked to leave his job a year ago after an unacceptably high number of errors surfaced in a review of his work, including missed cancers.
A Leamington woman whose case helped spark the Windsor investigation will announce legal action today in her case.
Laurie Johnston had a mastectomy last November at Windsor's Hotel-Dieu Grace Hospital, even though it turned out she did not have breast cancer.