 A high resolution MRI of the brain will be obtained in all children witg a 1.5 Tesla Signa General Electric scanner using a 3D T1-weighted FSPGR sequence TRTETINEX: 10.52.26001, flip angle 10, matrix size 256 x 192, yielding 124 axial slices and a thickness of 1.2 mm, field of view 22 cm. The acquisition duration is 6 minutes. In addition, FLAIR and T2 axial and coronal sequences will be also acquired. 