Review Question - QID 214945

A 66-year-old woman presents to the emergency room after experiencing a tonic-clonic seizure. She has been having worsening headaches and intermittent nausea over the past 5 months. The headaches are constant and dull, and they typically worsen when she sneezes or laughs. Recently, she has become increasingly nauseous and has vomited twice in the past 10 days. Her medical history is significant for type 2 diabetes mellitus and hypertension for which she takes metformin and losartan. Her temperature is 98.6°F (37.0°C), blood pressure is 115/70 mmHg, pulse is 70/min, and respirations are 12/min. She is noted to have papilledema on fundoscopy, but physical exam is otherwise normal. Her CT scan findings are presented in Figure A. Which of the following is the most likely diagnosis?