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Figure 1. Classes of aortic dissection: class 1, classic
dissection with flap between true and false aneurysm and clot
in false lumen; 2, intramural hematoma; 3, limited intimal tear with
eccentric bulge at tear site; 4, penetrating atherosclerotic ulcer with
surrounding hematoma, usually subadventitial; 5, iatrogenic
or traumatic dissection illustrated by coronary catheter
causing dissection.
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