Fig. 2

Probability of treatment success and facial hypoesthesia. The number of pain-free patients and hypoesthesia-free patients was evaluated with the Kaplan-Meier method, and defined as the interval between the date of treatment with radiosurgery and the date of recurrence of pain or hypoesthesia. Patients presenting with initial treatment failure were pooled with recurrent patients (in this case, the date of recurrence was defined at 1 month). The overall percentage of patients free from pain was 82.8% at 12 months and 81.1% at 24 months. The percentage of patients free from pain (class I to IIIa) at 12 and 24 months was 73.6 and 73.6%, respectively in the 5-mm group vs 90.2 and 87.8% in the 6-mm group (p = 0.045). The percentage of hypoesthesia was 11.3 and 30.8% at 12 and 24 months, respectively in the 5-mm group and 47.0 and 58% in the 6-mm group (p = 0.002)