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that it is more probable than not that trigeminal neuralgia or trigeminal neuropathy and death from trigeminal neuralgia or trigeminal neuropathy can be related to relevant service rendered by veterans or members of the Forces under the VEA, or members under the MRCA.
Note: MRCA, relevant service and VEA are defined in the Schedule 1 – Dictionary.
 1.                Factors that must exist
At least one of the following factors must exist before it can be said that, on the balance of probabilities, trigeminal neuralgia or trigeminal neuropathy or death from trigeminal neuralgia or trigeminal neuropathy is connected with the circumstances of a person's relevant service:
 1.           having maxillary, sphenoid or frontal sinus barotrauma involving the affected trigeminal nerve, within the 3 months before clinical onset or clinical worsening of trigeminal neuropathy;
 2.           having one of the following traumatic injuries to the affected trigeminal nerve:
         1.           mechanical injury caused by compression, crush, transection or stretching;
         2.           chemical burn;
         3.           thermal burn;
within the 3 months before clinical onset or clinical worsening of trigeminal neuropathy;
 1.           having an injury to the affected trigeminal nerve as a result of a dental or surgical procedure or injury to the cornea as a result of surgical or laser treatment, within the 3 months before clinical onset or clinical worsening of trigeminal neuropathy;

          1.           undergoing one of the following procedures for the treatment of trigeminal neuralgia, involving the affected trigeminal nerve, within the 2 years before clinical onset or clinical worsening of trigeminal neuropathy:
                  1.           fractionated stereotactic radiotherapy;
                  2.           Gamma Knife radiosurgery;
                  3.           microvascular decompression;
                  4.           peripheral alcohol injection;
                  5.           percutaneous rhizotomy, including chemical (glycerol) rhizolysis, mechanical balloon compression and radiofrequency thermocoagulation;
 1.           undergoing a course of therapeutic radiation, where the affected trigeminal nerve was in the field of radiation, within the 6 months before clinical onset or clinical worsening of trigeminal neuropathy;
 2.           having osteoradionecrosis of the mandible at the time of clinical onset or clinical worsening of trigeminal neuropathy;
 3.           having bisphosphonate-related osteonecrosis of the jaw at the time of clinical onset or clinical worsening of trigeminal neuropathy;

          1.           having vascular compression of the trigeminal nerve close to its point of entry into the brainstem, by one of the following:
                  1.           tortuous or aberrant loop of arteries or veins;
                  2.           haemangioma;
                  3.           aneurysm;
                  4.           venous sinus thrombosis;
                  5.           arteriovenous malformation;

         at the time of clinical onset or clinical worsening of trigeminal neuralgia;
 1.           having a mass lesion which compresses, displaces or infiltrates the affected trigeminal nerve, at the time of clinical onset or clinical worsening;
Note: Examples of a mass lesion that can compress, displace or infiltrate the trigeminal nerve include a benign or malignant neoplasm, haematoma, abscess, granuloma, amyloidoma, cyst or benign fibro-osseous