Evaluation of Cerebrospinal Fluid Flow in Adolescent Idiopathic Scoliosis

Common Inclusion Criteria for the 2 groups : * Female subject aged 12 to \< 18 years old * Affiliated to the French social security system * Having signed the inform consent form * Whose parents have given their consent Additional Inclusion Criteria for the AIS group: * Subject with right thoracic AIS defined by the existence of a 3D spine deformation with a frontal deviation to right dorsal convexity with a Cobb angle of at least 20°, and a rotation of at least 20°, as evidenced by the presence of a vertebral gibbosity ≥ 5° at the Bunnel scoliometer. If the scoliosis has more than one curvature, the right chest curvature should be the greatest high (highest frontal Cobb angle) * Subject with x-rays of total spine, face and profile under load, according to the EOS technique, dating from less than 3 months. Common Exclusion Criteria for the 2 groups: * Instability to submit to the medical follow-up of the study for psychic, social or geographical reasons * At least 6 "cafe au lait" spots with a size ≥ 1.5 cm (may be suggestive of neurofibromatosis) * Ligament hyperlaxity confirmed by a Beighton score \>4/9 (which may be suggestive of scoliosis secondary) * Contraindications of a cerebro-medullary MRI: claustrophobia, foreign bodies, and ferrometallic clips of the trunk or cephalic segment, cochlear implants, stimulators and implantable cardiac defibrillators, insulin pump * Inequality in length of the lower limbs ≥ 20 mm on clinical examination * Subject presenting neur…