Inclusion Criteria:  Adult patients (18 years and over); Supported in the neurosurgery department or at the assessment and treatment center for pain for unilateral essential trigeminal neuralgia with search for vasculo-nervous conflict;  Exclusion Criteria:  Patient with neurodegenerative or inflammatory neurological pathology; Patient who has already been operated on for a DMV; Absolute contraindication to MRI Patient benefiting from a legal protection measure; with impaired judgment skills or unable to receive information; Pregnant or breastfeeding women