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Trigeminal neuralgia with neither electrophysiological tests nor MRI showing significant abnormalities.

Diagnostic criteria:
  1. Recurrent paroxysms of unilateral facial pain fulfilling criteria for 13.1.1 Trigeminal neuralgia, either purely paroxysmal or associated with concomitant continuous or near-continuous pain
  2. Neither Classical trigeminal neuralgia nor Secondary trigeminal neuralgia has been confirmed by adequate investigation including electrophysiological tests and MRI1
  3. Not better accounted for another ICHD-3 diagnosis.

A contact between a blood vessel and the trigeminal nerve and/or nerve root is a common finding on neuroimaging in healthy subjects. When such a contact is found in the presence of 13.1.1 Trigeminal neuralgia but without evidence of morphological changes (eg, atrophy or displacement) in the nerve root, the criteria for Classical trigeminal neuralgia are not fulfilled and the condition is considered idiopathic.