Aneurysm

Localised abnormal dilation of blood vessel or the wall of the heart

True aneurysm - all three layers of artery are involved

False/pseudoaneurysm - breach in vascular wall leading to an extravascular hematoma which communicates with intravascular

 

Dissection

When blood enters the wall of an artery as a hematoma dissecting between the layers. May arise in aneurysmal arteries