system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
An otherwise healthy 78-year-old man is brought to the emergency department by his daughter because of a 1-day history of a diffuse headache and an inability to understand speech. There is no history of head trauma. He drinks one to two beers daily and occasionally more on weekends. His vital signs are within normal limits. Mental status examination shows fluent but meaningless speech and an inability to repeat sentences. A noncontrast CT scan of the head shows an acute hemorrhage in the left temporal lobe and several small old hemorrhages in bilateral occipital lobes. Which of the following is the most likely underlying cause of this patient's neurological symptoms?
assistant
Amyloid angiopathy