Fig. 2
From: Regional cerebral blood flow as predictor of response to occipital nerve block in cluster headache
Local decreases (blue) and increases (red) of rCBF across all CH patients following GONB. Brain areas in blue include medial temporal gyrus, cerebellum and substructures of basal ganglia including caudate and putamen. Cluster in red colour corresponds to secondary visual cortex. Data included four CBF maps per patient and session. All clusters are significant at p < 0.05 (FWE corrected; initial height threshold set to 0.001). GONB = greater occipital nerve block; R = right; L = left