Patients with immunosuppression often have delayed or atypical presentations
Fever is not a reliable marker for surgical disease<unk>  may be particularly misleading in elderly or diabetics
Consider pain in any abdominal or pelvic region in a female of child-bearing age, including pre-teens, is an ectopic pregnancy until proven otherwise
Abdominal pain
Abdominal aortic aneurysm
Nausea and vomiting 
Aortocaval fistula
Nausea and vomiting
Acute gastroenteritis
Diffuse abdominal pain
Aortoenteric fisulta