7th June 2023

An 82-year-old woman is referred to a rapid access geriatrics clinic with a short history of progressive cognitive impairment

An 82-year-old woman is referred to a rapid access geriatrics clinic with a short history of progressive cognitive impairment. Her past medical history includes osteoarthritis, fibromyalgia, and orthostatic hypotension. On examination, she scores 10/30 on her MoCA and has an abnormal gait with focal neurological signs. A CT brain is performed which is shown below:

CT brain.

Which of the following options is the correct cause for her current presentation?