Features favoring the diagnosis of coagulopathy-related hemorrhage:
(1) leakage of contrast material distant from the abdominal aorta
(2) hematocrit effect (blood cells settling out in the hematoma, taking a dependent distribution)
(3) bleeding into the rectus sheath
(4) bleeding into the iliopsoas component
Features favoring the diagnosis of leaking abdominal aortic aneurysm:
(1) leakage of contrast material close to the aneurysm
(2) hemorrhage contiguous to the aorta (author used a length > 3 cm)
(3) usually involves multiple retroperitoneal spaces
(4) CT changes of rupture (crescent sign, draped aorta sign, interruption of a continuous ring of calcification)
Features against the diagnosis of leaking abdominal aortic aneurysm:
(1) diameter of the aneurysm < 5 cm
(2) bleeding into the rectus sheath (never)
(3) bleeding into the iliopsoas component (uncommon)
