Fig. 9.

Distribution of the diffusion tensor parameters in patients with persistent headache after COVID-19 resolution (COV), healthy controls (HC) and patients with episodic migraine (EM) and chronic migraine (CM). The distributions of four representative regions of interest (ROIs), right and left retrolenticular part of internal capsule (RPIC-R/L; ROI3 and ROI2, respectively), right posterior limb of internal capsule (PLIC-R; ROI1), and right sagittal stratum (SS-R; ROI4), are shown. For internal capsule values, COV patients showed left-skewed FA and right-skewed RD distributions. MD, AD and RD distributions of right hemisphere regions were left-skewed in COV patients compared to CM and EM