Resting-State fMRI Study of Functional Connectivity After Gamma Knife Radiosurgery in Trigeminal Neuralgia

Inclusion Criteria: * Adults aged 18 to 73 years * Diagnosis of classical trigeminal neuralgia confirmed by an experienced neurologist * Unilateral facial pain with a normal neurological examination * Pharmacoresistant trigeminal neuralgia, defined as failure of at least two appropriate medical treatments, intolerance to medication, or recurrence despite adequate treatment * Indication for Gamma Knife radiosurgery as part of standard clinical care * Affiliation to a social security or health insurance system * Ability to understand the study information and provide written informed consent Exclusion Criteria: * Diagnostic uncertainty or secondary/idiopathic trigeminal neuralgia * Previous surgical or radiosurgical treatment for trigeminal neuralgia * Participation in another interventional clinical study at the time of inclusion * Individuals belonging to protected populations as defined by applicable regulations (including minors, adults under legal protection, persons deprived of liberty, pregnant or breastfeeding women) * Inability to understand the French language * Contraindication to 3 Tesla MRI, including claustrophobia, presence of pacemaker, defibrillator, metallic prosthesis, or any MRI-incompatible device or foreign body * Residence distance incompatible with the required follow-up schedule