Inclusion visit (D0):

• verification of inclusion and non-inclusion criteria
• information and collection of consent
• standard imaging protocol prescribed as part of the usual treatment: sagittal T1 and T2 slices after injection of contrast product (Gadolinium), o 3D STIR sequence.
• 3D PSIR sequence at the level of the cervical cord for the duration of the additional sequence is 10 minutes, for a total examination time of 45 minutes (instead of 35 minutes).

Inclusion Criteria:

• Patient over 18 years old
• To benefit from a medullary exploration planned by MRI 1.5T as part of a first evaluation or a re-evaluation of inflammatory involvement of the nevrax
• Express consent to participate in the study
• Affiliate or beneficiary of a social security scheme

Exclusion Criteria:

• Patient benefiting from a legal protection measure
• Pregnant, parturient or breastfeeding woman
• Absolute or relative contraindication to MRI

The study will be offered prospectively to patients presenting to the imaging department for a 1.5T MRI for bone marrow exploration, in the context of inflammatory involvement of the nevrax