"First day of radiation treatment. I look like I'm about to make a run for it, which is accurate."
That's what Shannen Doherty wrote on Instagram as she documented her experience Monday, giving the world glimpses of both her bald head and her trepidation.
The former "Beverly Hills, 90210" actress said radiation therapy was "frightening."
"Something about not being able to see the laser, see the treatment and having this machine moving around you just scares me," said Doherty, 45.
"I'm sure I'll get used to it but right now," Doherty concluded, "I hate it."
Doherty has been fighting breast cancer since March 2015 and had a single mastectomy in May 2016. In August, she shaved her head and explained that because the cancer was in at least one lymph node, she was going through chemotherapy and then radiation.
Her diagnosis came to light because of a lawsuit Doherty filed against her former management company in which she alleged, among other things, that the firm failed to pay her 2014 insurance premium on time, resulting in a lack of medical coverage until she could re-enroll in 2015. The firm has denied the allegations.