at the Mount Sinai Medical Center in New York City in 1991. [9] Marfan syndrome Classification and external resources Micrograph demonstrating myxomatous degeneration of the aortic valve - a common manifestation of Marfan syndrome . ICD - 10 Q 87.4 ICD - 9 759.82 OMIM 154700 DiseasesDB 7845 MedlinePlus 000418 eMedicine ped/1372