<prompt> Most common cardiovascular abnormality seen in Marfans Syndrome on presentation is:Mitral Valve ProlapseDilation of Aoic SinusesCoarctation of AoaBicuspid Aoic Valve  <response>: Answer is A Mitral Valve Prolapse Valvular Hea Disease: A Companion to Braunwalds Hea Disease by Otto Elsevier Health Sciences The single most common cardiovascular abnormality seen in patients with Marfans Syndrome at the time of presentation is Mitral Valve Prolapse. Mitral Valve Prolapse is the most frequent abnormality seen at the time of presentation 80 - 100 -Valvular Hea Disease: A Companion to Braunwalds Hea Disease Mitral Valve Prolapse and Dilation of the Ascending Aoa at the level of aoic sinuses are the two most common cardiovascular abnormalities seen in patients with Madans Syndrome Mitral Valve Prolapse is the single most common cardiovascular abnormality Dilation of the Ascending Aoa at the level of aoic sinuses is the next most common anomaly. 