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Aims Surface-based morphometric analyses should complement volumetric findings, providing more specificity in the metric affected (thickness vs. gyrification). Whereas cortical thickness alterations probably rely on altered trajectories of cortical maturation or neurodegenerative processes, cortical folding (gyrification) abnormalities are thought to reflect early alterations to brain development. Methods In the present study we investigated cortical thickness and gyrification in 29 patients with MOH according to International Headache Society criteria and 29 age- and gender matched controls, using FreeSurfer. Correction for multiple comparisons was performed. Results In patients with MOH cortical thickness was decreased in the left middle frontal gyrus (rostral part) compared to controls, whereas local gyrification was increased in the right fusiform gyrus and adjacent temporal regions, as well as in the right occipital pole. Conclusions Decreased cortical thickness in frontal regions corresponds to decreased grey matter volume in similar regions. Increased local gyrification in the right fusiform gyrus corresponds to increased grey matter volume in the previous volumetric study. Increased gyrification in occipital regions might be related to increased susceptibility for cortical spreading depression.

EHMTI-0195. Cortical changes in medication-overuse headache