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In page Atypical trigeminal neuralgia:

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The subject of atypical trigeminal neuralgia is considered problematic even among experts. The term atypical TN is broad and due to the complexity of the condition, there are considerable issues with defining the condition further. Some medical practitioners no longer make a distinction between facial neuralgia (a nominal condition of inflammation) versus facial neuropathy (direct physical damage to a nerve).[citation needed]