Focal dissection of the descending aorta in Marfan syndrome on CT and MRI

A CT image through the heart (A) shows a communication (arrowhead) between the true lumen of the thoracic aorta and a large compressive false lumen (arrow). Image B is an MRI of the aorta in the lateral projection and shows a focal dissection with communication at mid aortic level (arrow) between the true lumen and the false lumen (arrowhead).