Fig. 6.

Distribution of the diffusion tensor parameters in patients with persistent headache after COVID-19 resolution (COV) and healthy controls (HC). The distributions of the three regions with RD statistically significant differences between COV and HC, and the one for the left retrolenticular part of the internal capsule (RPIC-L), a representative region, are shown. COV patients showed lower FA and higher RD values than HC, and also non-significant lower MD and higher AD. PLIC-L left posterior limb of internal capsule, SCR-L left superior corona radiata, SLF-L left superior longitudinal fasciculus