Etiology

Acute appendicitis

Cholecystitis

Acute pancreatitis

Diverticulitis

Acute peritonitis

Mesenteric ischemia

Ruptured abdominal aortic aneurysm

Ruptured ectopic pregnancy

Ovarian torsion

Twisted ovarian cyst

Ureteral colic

Intestinal obstruction

Necrotizing enterocolitis

Midgut volvulus

Intussusception