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
A 68-year-old woman presents to the emergency department for leg weakness. About 4 hours ago, she was out walking her dog when she had a sudden onset of left-leg weakness. She had no prior symptoms and noticed nothing else except that she was unable to move her left leg like she normally could. This weakness lasted for roughly 3 hours, but it resolved completely while she was in the car on her way to the emergency department, she can move her leg normally now. Her medical history is notable for a 20-year history of hypertension and hyperlipidemia. Her heart rate is 80/min, the blood pressure is 148/92 mm Hg, and the respiratory rate is 14/min. Physical exam, including a thorough neurological exam, is unremarkable; strength is 5/5 throughout her bilateral upper and lower extremities. A noncontrast CT scan of her head is shown. Which of the following is the most likely diagnosis in this patient?
assistant
Transient ischemic attack