The most common visceral<unk> al<unk> , and the third most common abdominal<unk>  (after aorta and iliac vessels)
Etiologies include<unk> al fibrodysplasia, portal hypertension, and increased<unk>  AV shunting in pregnancy
Incidence on CT = 0.8%
Female:Male 4:1
2% result in life-threatening rupture
Increase risk of rupture in pregnancy (most commonly in 3rd trimester).  
Thought to be secondary to increase in estrogen, progesterone and relaxin causing<unk> al dilatation.
High maternal and fetal mortality post-rupture
Thought to be secondary to increase in estrogen, progesterone and relaxin causing<unk> al dilatation.
High maternal and fetal mortality post-rupture
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