CTA Abdomen/Pelvis is the gold standard
Initial FAST exam may show fluid in left upper quadrant if ruptured aneurysm
Splenic artery aneurysm
Calcified left adrenal haematoma
Splenic infarction
Other causes of hemoperitoneum if ruptured
Mesenteric vein thrombosis
Ruptured ectopic pregnancy
Superior mesenteric artery syndrome
Abdominal aortic aneurysm