This is a before-after, observational, prospective, multicenter cohort study. The study will consist of 2 phases: an initial observational phase of a minimum of 3 months before the Therapeutic Education Program (TEP) intervention, then a phase of evolution analysis of at least 3 months.

During the first observational phase, the quality of life assessment will be carried out 3 months apart without intervention. The data obtained during this first phase will make it possible to characterize the functional impact in patients, to verify the reproducibility of our evaluations, and to evaluate the spontaneous evolution of the parameters over a period of 3 months.

During the second phase of evolution analysis, the quality of life will be assessed at 3 month intervals (M9, M12) after the therapeutic Education Program (M6). The comparison between the evolution during the two phases, before and after the TEP will allow us to assess the benefits of the TEP.

Inclusion Criteria:

• Patient aged between 7 and 25 years old with Marfan Syndrome or related according to Ghent criteria
• For minors, no oral opposition from the holders of parental authority and consent of the minor.
• For adults, no oral opposition collected
• Patient affiliated to a social security scheme or equivalent

Exclusion Criteria:

• Inability of the patient to understand the content of the TEP sessions or the questionnaire about quality of life (non-French speaking, severe intellectual disability)
• Patient who has already participated in a TEP session for his pathology.
• Protected adult: patient under legal guardianship or curator protection

Patient with Marphan Syndrom