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Olivia MunnImage source, Getty Images

US actress Olivia Munn has revealed she was diagnosed with breast cancer last year, and has had four operations in the past 10 months.

Posting on Instagram, the 43-year-old Newsroom star said her surgeries had included a double mastectomy.

Sharing a message alongside pictures and a video from hospital, Munn said she had “wanted to get through the hardest parts before sharing”.

“Surprisingly, I’ve only cried twice,” she wrote.

Munn’s health update comes three days after she attended the Oscars with her husband, comedian John Mulaney. They share two-year-old son Malcolm.

The actress, who has appeared in Magic Mike, Iron Man 2 and X-Men: Apocalypse, said she found out about the cancer after testing for 90 different cancer genes and going for a mammogram.

Although those tests were negative, Munn said her doctor worked out her “breast cancer risk assessment score” – which later led to further tests including a biopsy, which showed “I had Luminal B cancer in both breasts”.

‘I’m lucky’

She wrote: “Luminal B is an aggressive, fast moving cancer.

“Thirty days after that biopsy I had a double mastectomy. I went from feeling completely fine one day, to waking up in a hospital bed after a 10-hour surgery the next.

“I’m lucky,” she added. “We caught it with enough time that I had options.”

Munn ended the post by praising Mulaney, her family and friends, as well as doctors, nurses and hospital staff.

“I’m so thankful to John for the nights he spent researching what every operation and medication meant and what side effects and recovery I could expect,” she said.

“For being there before I went into each surgery and being there when I woke up, always placing framed photos of our little boy Malcolm so it would be the first thing I saw when I opened my eyes.

“Thank you to the friends who’ve had breast cancer and the friends who connected me to friends who’ve had breast cancer for guiding me through some of my most uncertain and overwhelming moments.”