Abdominal aortic aneurysm

DDx

Perforated viscus, eg, peptic ulcer, appendix, gallbladder, diverticulitis
Pancreatitis or pancreatic pseudocyst
Urinary calculi
Pyelonephritis
Gastritis
Intestinal ischemia
Bowel obstruction
Musculoskeletal pain
Sudden death due to other causes, eg, ventricular fibrillation, myocardial infarction, pulmonary embolism