Review Question - QID 104795

A 20-year-old male college student presents to the emergency room with persistent vague abdominal pain, vomiting, and nausea. Notably, he also reports getting full with meals sooner than usual. He has recently been pledging at a fraternity and has participated in binge drinking, marijuana use, cocaine use, and intramural sports. He admits to sharing drinks and paraphernalia with other fraternity members and states that several of them have been ill recently. The patient has a past medical history of asthma and depression. He admits to using large amounts of ibuprofen recently to control pain secondary to minor orthopedic injuries from intramural sports. Physical exam demonstrates mild tachycardia and epigastric tenderness. His temperature is 99.5°F (37.5°C), blood pressure is 127/68 mmHg, pulse is 105/min, respirations are 17/min, and oxygen saturation is 98% on room air. A CT scan is performed and shown in Figure A. Which of the following is the most likely diagnosis?