Study of the Determinants of Coronary Atherosclerosis in Familial Hypercholesterolemia (ATHERO-FH Study)

Inclusion Criteria: * Person willing to sign the study consent form * Person affiliated with a current social security scheme * Person with a definite diagnosis of Familial Hypercholesterolemia, defined by a Dutch Lipid Clinic Network (DLCN) clinical-biological score \> 8 and/or an identified causal mutation in the LDL receptor (LDLR) gene, apolipoprotein B100 gene, PCSK9 gene, or apolipoprotein E gene * Male aged 40 years or older, or female aged 50 years or older * Ability to understand French for questionnaire completion * Person not taking any lipid-lowering medication or on a stable dose of lipid-lowering therapy for at least one month prior to inclusion (three months for PCSK9 inhibitors) at Visit 1 * Person not taking any antihypertensive medication or on a stable dose of antihypertensive therapy for at least one month at Visit 1 * Person not taking any antidiabetic medication or on a stable dose of antidiabetic therapy for at least 3 months at Visit 1 Exclusion Criteria: * Subject with a technical contraindication for coronary CT scan: patient diameter \> 70 cm and/or weight \> 250 kg * Patient with a history of atherosclerotic cardiovascular event (myocardial infarction, ischemic heart disease, coronary revascularization, ischemic stroke, carotid endarterectomy, lower limb arterial revascularization) * Patient allergic to iodinated contrast agents * Severe renal insufficiency: estimated glomerular filtration rate (eGFR) according to the CKD-EPI formula ≤ 30 ml/min * Subject with active cancer or in remission for less than 3 years * Subject who has received oral or intravenous corticosteroid therapy within the last 6 months * Subject with untreated or poorly controlled hypothyroidism * Subject receiving immunosuppressive or anticancer therapy * Subject refusing to participate * Subject under guardianship, curatorship, or judicial protection, or without social insurance coverage * Pregnant woman