Clinical Outcomes of Gamma Knife Radiosurgery in the Treatment of Patients with Trigeminal Neuralgia

Table 5

Barrow Neurological Institute pain intensity scale [26].

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BNI Class I

 No trigeminal pain; no medication

BNI Class II

 Some trigeminal pain; no medication

BNI Class IIIa

 No trigeminal pain; managed with medication

BNI Class IIIb

 Persistent trigeminal pain; managed with medication

BNI Class IV

 Some trigeminal pain; not adequately managed with medication

BNI Class V

 Severe pain or treatment failure

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