A 70-year-old woman is brought in by her son after she was found wandering the streets. Her son reports that she first started experiencing short-term memory loss around 4 years ago. Since then she has become more forgetful. From around 6 months ago, she has needed reminders for self-hygiene and medications. There is no history of recent falls, hallucinations, weight loss, or low mood.

Her medical history is significant for hypertension and dyslipidemia for 4 years, which are well controlled on ramipril and atorvastatin. She has never smoked and only drinks socially. She was educated up to high school and speaks English fluently.

At a routine health checkup 1 week ago, a full blood count, fasting plasma glucose, serum electrolytes, liver functions, renal functions, and urinalysis were all normal.