Fig. 1

a Success rate of ONB among the different diagnoses. The height of bars indicates total number of patients; the black parts indicate patients with success. b Pain intensity ratings on a verbal rating scale (VRS) before and after ONB in various facial pain symptoms. Black bars indicate ratings before ONB, gray bars after ONB. FP persistent idiopathic facial pain, TN trigeminal neuralgia, TNP trigeminal neuropathic pain, ON occipital neuralgia