Actress Shannon Doherty said she felt scared and frightened as she revealed details of her first day of radiotherapy in her fight against breast cancer.
The former star of Beverly Hills, 90210 posted a photograph on Instagram from hospital as she prepared for the latest stage of her treatment.
"First day of radiation treatment," she wrote. "I look like I'm about to make a run for it which is accurate."
She added: "Radiation is frightening to me. Something about not being able to see the laser, see the treatment and having this machine moving around you just scares me. I'm sure I'll get used to it but right now ... I hate it.
"#radiation #radiationmondaysucks #stillfightinglikeagirl."
Shannen, 45, has fought a high-profile battle with cancer, documenting her treatment on social media and previously sharing images of herself shaving her head.
She was honoured with the American Cancer Society's Courage Award in Los Angeles earlier this month, where she revealed she was about to undergo radiotherapy after completing chemotherapy.
"I'm feeling ridiculously lucky and very blessed," she told the Press Association. "Cancer has changed my life for the better.
"It's made me a better human being. It stripped away all of the walls and the barriers.
"It exposes any lie in your life whatsoever. It exposes who's not really truly there for you and who really is there for you."
Shannen, who also starred in fantasy drama series Charmed, was diagnosed with breast cancer in March 2015 and underwent a single mastectomy in May this year.