Table 1: Clinical preoperative features.

Clinical items Size Percentage (%)
Laterality Left 18 42.85
Right 21 50
Bilateral 3 7.14
V2V3 22 52.38
V2V1 3 7.14
Topography V2 11 26.2
V3 6 14.28
> 10 5 11.9
10 11 26.2
Pain scale (on crisis) 9 13 30.95
8 6 14.28
Non Specified 7 16.66
6 17 40.47
Pain scale (out of crisis) 5 10 23.8
≤ 4 6 14.28
Non Specified 9 9
Number of specific drugs used before 1* 9 21.42
2 21 50
≥ 3 12 28.57

*Few patients were intolerants to specific drugs as Carbamazepine and the neuralgia were refractory to the substituent drug.