Case Presentation: 56-year-old man with past medical history of abdominal aortic aneurysm surgery was brought to the Emergency Room for change in mental status and having bloody vomitus and melenic stool. On admission, abdominal exam was unremarkable, blood pressure was 110/77 mmHg, heart rate 103/min, Temperature 99.8 °C, Respiratory rate 20 per minute, hemoglobin 11.1 [...]