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Aortic intramural hematoma (IMH) has been considered a variant or precursor of aortic dissection with no entry tear or false lumen flow; however, the pathophysiological mechanism, risk factors, and evolution are rather different from those of classic dissection. Hematoma forms within the aortic wall as a result of either hemorrhage of the vasa vasorum or, less commonly, an intimal fracture of an atherosclerotic plaque. The marked relationship between IMH and atherosclerotic disease explains the older age of these patients compared with those with aortic dissection, the higher incidence of arterial hypertension, and the tendency for descending aorta involvement (50% to 60%).1–5Article see p 2046 Evolution of the IMH in the acute phase may be highly dynamic, with bleeding of the aorta wall increasing progressively, stabilizing or provoking disruption of the intima, which may lead to a classic or localized dissection. This intimal disruption may be seen in the early hours of presentation or some months after the intramural bleeding has occurred2,5–8 (Figure 1). For this reason, IMH has been considered a precursor of aortic dissection. However, 2 significant differences between IMH and aortic dissection appear to be well defined. First, IMH might regress spontaneously with time4,5,7,9 (Figure 2). Second, fewer severe cardiovascular complications, valvular aortic regurgitation, and visceral or peripheral ischemia are present.2,8 Therefore, IMH almost resembles an aortic dissection, but with a distinct, unique pathological nature. Figure 1. Acute type A IMH (white arrows) with ascending aorta diameter of 45 mm and intramural thickness of 8 mm (left). After 6 days, the ascending aorta dissection was visualized. Black arrows show the intimal flap (right).Figure 2. Acute type A IMH (white arrow) with extension to descending aorta. Aortic diameter was 54 mm, and IMH thickness was 12 mm (left). After 6 months of medical …

Is the Optimal Management of Acute Type A Aortic Intramural Hematoma Evolving?