The authors describe a case of dissecting aneurysm of the abdominal aorta observed by magnetic resonance imaging (MRI) in a patient with diffuse aneu rysmal disease. A dissected atherosclerotic plaque confined to the infrarenal aorta occasioned an antegrade and an unusual retrograde dissection. MRI properly indicated this condition, showing the tear inside the aortic wall, ex cluding the thoracic entry of dissection, and assessing aortic and iliac artery aneurysmal involvement.
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