Review Question - QID 214923

A 64-year-old man is brought to the clinic by his daughter, who is concerned that her father has not been acting like himself in the past year. He has been uncharacteristically impulsive and acting inappropriately in social situations. More recently, she has noticed that he has had worsening memory and trouble with managing his finances. His past medical history includes hypertension, type 2 diabetes mellitus, and benign prostatic hyperplasia. His daily medications include lisinopril, metformin, and sitagliptin. Today, his temperature is 37.2°C (98.9°F), blood pressure is 146/88 mmHg, pulse is 78/min, respirations are 13/min, and O2 saturation on room air is 99%. He appears mildly disheveled and continuously eats candy out of the jar on the exam room desk throughout the interview. An MRI demonstrates the findings shown in Figure A. Which of the following is the most likely diagnosis?