Angelina Jolie had her ovaries and fallopian tubes removed last week after doctors detected early signs of cancer.
"Two years ago I wrote about my choice to have a preventive double mastectomy. A simple blood test had revealed that I carried a mutation in the BRCA1 gene. It gave me an estimated 87 percent risk of breast cancer and a 50 percent risk of ovarian cancer. I lost my mother, grandmother and aunt to cancer," Jolie wrote in an op-ed in the New York Times on Monday.
"I promised to follow up with any information that could be useful, including about my next preventive surgery, the removal of my ovaries and fallopian tubes," the 39-year-old actress said.
The procedure had been pre-planned, she explained, and while it is less complex than her previous mastectomy, the "effects are more severe" because it "puts a woman into forced menopause."
The Oscar-winner thought that she had months before she needed to have the surgery, but two weeks ago she got a call from doctors with results from a recent blood test showing markers that could be a sign of early cancer.
"I went through what I imagine thousands of other women have felt. I told myself to stay calm, to be strong, and that I had no reason to think I wouldn't live to see my children grow up and to meet my grandchildren," Jolie said.