A 43-year-old man was admitted to a hospital because of acute dyspnea and nocturnal orthopnea. Echocardiogram and chest CT showed the dilation of thoracic aorta from the root to ascending portion. On the third hospital day, he died suddenly. At autopsy, the cause of death was indicated to be a tear of an aortic valve due to a rupture of the aneurysm of Valsalva's sinus, followed by acute aortic regurgitation and acute cardiac insufficiency. Histopathological findings of thoracic aorta revealed mesoaortitis, characterized by patchy destruction of the media with a moth-eaten appearance of the medial elastic laminae and a microgranuloma formation, a perivascular mononuclear cell infiltration of the vasa vasorum, and a fibrous thickening of the intima and adventitia. However, there were no abnormalities in main branches of aorta and abdominal aorta, and no systemic vasculitis. This case is a rare one in the clinical course, and may be important to be differentiated from other cases with aortitis, especially Takayasu arteritis and syphilitic aortitis.
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