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Circulation
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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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