'90210' star Shannen Doherty reveals her cancer spread to her brain: 'My fear is obvious'

• Shannen Doherty revealed in an Instagram video that her cancer has spread to her brain.
• "My fear is obvious," the actress wrote in a caption of a video showing her during radiation.
• Doherty was diagnosed with breast cancer in 2015.

"Beverly Hills, 90210" star Shannen Doherty revealed Tuesday in an emotional video shared to Instagram that her cancer has spread to her brain.

In the video, Doherty is shown undergoing radiation as tears are visible in her eyes. In a caption of the video on Instagram, the actor notes that she underwent her first round of radiation on January 12.

"My fear is obvious. I am extremely claustrophobic and there was a lot going on in my life," Doherty wrote in the caption before sharing that she's "fortunate" for her doctors.

"But that fear…. The turmoil….. the timing of it all…. This is what cancer can look like," she continued.

Doherty was first diagnosed with breast cancer in 2015 and it spread to her lymph nodes by the following year, CBS News said. The Associated Press reported that the actress was in remission by 2017, but three years later she announced on "Good Morning America" that the cancer had returned as stage four.

"I don't think that I've processed it. It's a bitter pill to swallow in a lot of ways," she said in 2020.