Shannen Doherty receives radiation therapy on her brain amid cancer battle trends now

Shannen Doherty shared a new development in her ongoing battle with stage IV breast cancer to Instagram on Tuesday.

The actress, 52, had a CT scan done on January 5 that revealed cancer cells had spread from their original site to her brain — known as 'brain metastases.'

Breast cancer is among those most likely to lead to brain metastases which could cause a tumor or tumors in the brain, as per the Mayo Clinic.

Shannen explained that she underwent her first round of radiation therapy on January 12 and that she's fearful despite having a 'great' medical team.

Included with her post was a heartbreaking clip of herself crying as she received the cancer treatment at Cedars-Sinai Medical Center in Los Angeles.

'January 12, 2023,' began Shannen. 'On January 5th, my ct scan showed Mets in my brain.'

She then referenced a video clip shared Monday which showed her getting some sort of an MRI.

The star explained that it is part of the 'process of getting fitted for the mask which you wear during radiation to your brain.'

In the clip, she is seen lying down as doctors placed a blue mold over her face. They had her bite down to make sure it adhered to her mouth and chin.

Shannen began to cry as they held the edges of the mask down and pinned them to a board behind her head before moving her into the machine.

The actress continued Tuesday: 'January 12, the first round of radiation took place. My fear is obvious.'

Radiation treatment uses 'energy beams to destroy cancer cells' and it can 'target all or part of the brain, depending on a person’s diagnosis,' according to NYU Langone Health.

'I am extremely claustrophobic and there was a lot going on in my life,' Shannen wrote. 'I am fortunate as I have great doctors like Dr Amin Mirahdi and the amazing techs at cedar sinai.