Class I – Classic dissection with separation of intima/media and dual lumens; there is a flap between true and false aneurysm and clot in false lumen. Class II – Intramural hematoma with separation of intima/media but no intraluminal tear or flap on imaging. Class III – Limited intimal tear without hematoma and eccentric bulge at tear site (limited dissection). Class IV – Atherosclerotic ulcer penetrating to adventitia with surrounding hematoma that is usually subadventitial. Class V – Iatrogenic or traumatic dissection (eg, due to a cardiac catheterization).
Modified from:
Lahey Clinic, Burlington, MA.
Svensson LG, Lalsib JB, Eisenhauer AC, et al. Intimal tear without hematoma: an important variant of aortic dissection that can elude current imaging techniques. Circulation 1999; 99:1331.
Graphic 62132 Version 6.0
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