Isolated hypertrophic interstitial neuropathy of the trigeminal nerve associated with trigeminal neuralgia. Case report of an entity not previously described.

Hypertrophic interstitial neuropathy (HIN) of the trigeminal nerve was observed in a patient with trigeminal neuralgia who had no other neurological abnormalities. Pathological documentation confirmed focal HIN. No similar histologically documented case of isolated trigeminal nerve involvement by HIN has been reported previously.