Bleeding into<unk>  space
Difficult to diagnose given poor sensitivity of physical exam findings (Cullens, Grey-Turners)
Can accumulate 4L blood before tamponade
Trauma (renal, vascular, colon, pancreas or pelvis)
Leaking/ruptured AAA
Iatrogenic (colonoscopy, cardiac catheterization, femoral line placement)
Spontaneous (coagulopathy)<unk> c pancreatitis
Retroperitoneal hemorrhage
Diaphragmatic trauma
Duodenal hematoma
Liver trauma
Bowel perforation
Splenic trauma
Abdominal compartment syndrome
Pelvic fractures