Review Question - QID 109327

An 81-year-old woman is brought to the emergency room by her son after witnessing the patient fall and hit her head. The son reports that the patient was in her usual state of health until she complained of chest palpitations. This startled her while she was climbing down the stairs and lead to a fall. Past medical history is significant for hypertension and atrial fibrillation. Medications are lisinopril, metoprolol, and warfarin. Temperature is 99°F (37.2°C), blood pressure is 152/96 mmHg, pulse is 60/min, respirations are 12/min, and pulse oximetry is 98% on room air. On physical examination, she is disoriented and at times difficult to arouse, the left pupil is 6 mm and non-reactive to light, and the right pupil is 2 mm and reactive to light. A right-sided visual field defect is appreciated on visual field testing. There is 1/5 strength on the right upper and lower extremity; as well as 5/5 strength in the left upper and lower extremity. A computerized tomography (CT) scan of the head is shown. Which of the following most likely explains this patient’s symptoms?