The aim of the study is to compare ESC recommendations on cardiovascular (CV) risk stratification with the achievement of a CAC (Coronary Artery Calcification).

The development of a CAC, currently not systematically offered to these patients to refine CV risk, could make it possible to offer more intensive management of CV risk facors for patients who objectively have a high CV risk as evidenced by a high coronary calcium score.

LDL target recommandations have become more aggressive with a very high level of evidence in type 2 diabetic patients but low in type 1 diabetic patients because there is no specific CV intervention study for T1D patients.

These recommendations have far-reaching consequences because they would justify introducing in young type 1 diabetic patients, considered from the outset to be at moderate cardiovascular risk (young T1DM <35 years old) or even at high cardiovascular risk (duration of diabetes > 10 years) or very high cardiovascular risk (duration of diabetes > 20 years), treatment with statins or even aspirin, based only on the length of time they have had diabetes.

The realization of a CAC, currently not systematically offered to these patients to refine CV risk, could make it possible to propose a more intensive management of CV risk factors for patients with objectively high CV risk attested by a high coronary calcium score.

In this case the introduction of treatment with statins would be indicated.

Inclusion Criteria:

• Aged ≥ 18 years and ≤ 35 years; Type 1 diabetic patient (defined by T1DM antibody positivity or onset in pediatric age); In primary cardiovascular prevention (with no CV events); Patient not treated by statins; Duration of diabetes > 5 years; Equipped with a continuous interstitial glucose measurement system for at least 14 days; No previous CAC performed Patient with social security or with third party coverage. Free subject, without guardianship or curatorship or subordination; Informed consent signed by the patient after clear and fair information about the study.

Exclusion Criteria:

• Cardiovascular secondary prevention patients (with a previous CV event); ECG abnormality suggestive of coronary ischemia; Intolerance or contraindication to statins Person benefiting from reinforced protection, namely minors, persons deprived of their liberty by a judicial or administrative decision, persons staying in a health or social establishment, adults under legal protection and finally patients in emergency situations; Pregnant and/or breastfeeding woman.