Review Question - QID 214596

A 54-year-old man presents to the emergency department with severe abdominal pain. For 7 months, he has noticed abdominal pain shortly after eating, and the pain worsened in intensity this week. Prior to today, the pain was 6/10, sharp, and gnawing in nature and would go away after 1 hour. Today, the pain is a 10/10 and has been unrelenting for 30 minutes. He denies chest pain, shortness of breath, vomiting, or diarrhea. He has noticed that his stools have been darker than usual lately. His temperature is 99.2°F (37.3°C), blood pressure is 90/62 mmHg, pulse is 95/min, and respirations are 19/min. On exam, his abdomen is rigid with guarding. On abdominal ultrasound, there is free fluid in the hepatorenal recess. Perforation of which of the following vessels most likely contributed to the findings on ultrasound?