Concussion and traumatic brain injury Quiz: Ace Your Exams

A 70-year-old man is brought to his primary care physician for evaluation of personality changes. Over the past two months, he has become progressively irritable and apathetic. His partner also notes fluctuations in his behavior stating, “He has good and bad days.” His medical history includes hypertension and atrial fibrillation, for which he takes hydrochlorothiazide and warfarin. The patient’s temperature is 37.5°C (99.5°F), pulse is 75/min, and blood pressure is 150/80 mmHg. On physical examination, the patient appears indifferent and responds vaguely to questions. The patient undergoes a non-contrast CT brain as demonstrated below. Which of the following is the most likely diagnosis?  


^{Reproduced from: Radiopaedia}