Review Question - QID 102802

A 70 year-old-woman is brought to the emergency department for evaluation of slurred speech starting approximately 1 hour prior to arrival. She has a history of hypertension and hyperlipidemia for which she takes losartan and atorvastatin. Her temperature is 98.6°F (37.0°C), pulse is 80/min, blood pressure is 160/80 mmHg, and respirations are 16/min. She is alert and oriented, and her speech is notably dysarthric. Loss of pain and temperature sensation is noted over the left side of the face. There is ptosis and miosis of the left eye. There is loss of pain and temperature sensation over the right upper and lower extremities. This patient's lesion most likely affects which of the following areas of the brain?