The intimal thickening on the posterior aortic wall is composed of small number of dedifferentiated smooth muscle cells (SMC). Some of these cells are in apoptosis. On the anteromedial wall, the intima and media are composed of proliferated SMC and small number of SMC which exhibit contractile phenotype. In all parts of the aortic wall, there is a large number of pseudocysts with large amount of mucins, without presence of inflammatory cells.
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