II. Causes: Gastrointestinal
- Peritonitis
- Pancreatitis
- Early Appendicitis
- Mesenteric Adenitis
- Gastroenteritis
- Colitis
- Intestinal Obstruction
III. Causes: Hematologic
IV. Causes: Vascular
- Mesenteric Thrombosis
- Abdominal Aortic Aneurysm
- Splenic artery aneurysm
- Mesenteric Artery aneurysm