Class 1 | Classical aortic dissection with an intimal flap between true and false lumen |
Class 2 | Medial disruption with formation of Intramural haematoma/haemorrhage |
Class 3 | Discrete/subtle dissection without haematoma, eccentric bulge at tear site |
Class 4 | Plaque rupture leading to aortic ulceration, penetrating aortic atherosclerotic ulcer with surrounding haematoma, usually subadventitial |
Class 5 | Iatrogenic and traumatic dissection |