<prompt> In Marfans syndrome, Aoic aneurysm occurs most commonly in:Ascending aoaDescending aoaAbdominal aoaArch or aoa  <response>: Answer is A Ascending Aoa Aoic aneurysms in Marfans syndrome occur most frequently in the ascending aoa. Cardiovascular lesions in Marfans syndrome Cardiovascular lesions are the most life threatening features of Marfans syndrome. Mitral valve prolapseQ MVP Loss of connective tissue suppo in mitral valves leaflets makes them soft and blowy creating the so-called floppy valve. Mitral regurgitation frequently results. Dilatation of Ascending Aoae Media undergoes cystic necrosis cystic medionecrosis. Loss of medial suppo results in progressive dilatation of aoic valve ring and root of aoa Severe aoic incompetenceQ Aoic dissections 