MS-3668

A 75-year-old female patient presents to the Emergency Department after experiencing a fall. She has a medical history of hypertension and type 2 diabetes, and is a smoker with a BMI of 34 kg/m². Her family history includes high cholesterol in her father and older sister, who both passed away due to a heart attack.

The patient denies any head trauma from the fall and has a regular pulse of 78 bpm. Upon conducting a full neurological examination, it is discovered that her left arm and left leg have a power of 3/5. Additionally, her smile is asymmetrical and droops on the left side.

What is the most probable underlying cause of her symptoms?