Female patient, 61 years of age, was sent to the Neurology service by an Ophthalmologist. She complains of difficulty in reading and in differentiating the steps of a stairs, which progressively worsened in the last 3 years, as well as difficulties in memorizing recent information for the past 5 months. She is currently dependent of others for instrumental activities of daily life. Denies comorbidities, family history of dementia or use medication. No other neurological signs. The work up was done with laboratory exams and a brain MRI.

Question:
Based on the clinical picture and the images, which one of the following is the most likely diagnosis?