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Trigeminal neuralgia (TN) is a chronic pain disorder that affects the fifth cranial nerve.
Other reported manifestations of the secondary affliction are paresthesia of the mental and infraorbital regions or unilateral decreased sensation to pinprick in all three divisions of the fifth cranial nerve.
All of the trigeminal autonomic cephalgias have pain localized in V1, the ophthalmic region of the fifth cranial nerve, so the site of the pain can't aid in the diagnosis.