1 in 5000 incidence Health Topics: What is Marfan Syndrome? What is Marfan Syndrome? https://www.nhlbi.nih.gov/health/health-topics/topics/mar/ What is Marfan Syndrome? National Institute of Health-Marfan Syndrome https://www.nhlbi.nih.gov/health/health-topics/topics/mar/ What Is Marfan Syndrome? arfan arfan "What Is Marfan Syndrome?" NIHLB