Altered Hypothalamic Region Covariance in Migraine and Cluster Headache: A Structural MRI Study
Abstract
OBJECTIVES: The hypothalamus plays a key role in both migraine and cluster headache (CH). As brain region-to-region structural correlations are believed to reflect structural and functional brain connectivity patterns, we assessed the structural covariance patterns between the volume of the hypothalamic region and vertex-by-vertex measurements of cortical thickness in patients with migraine and in those with CH relative to healthy controls (HC).
METHODS: T1-weighted images were acquired on a 3T MRI scanner for a total of 59 subjects including 18 patients with CH (age: mean = 43.8, SD = 12.4), 19 with migraine (age: mean = 40.1, SD = 12.2), and 22 HCs (age: mean = 39.1, SD = 8.2). Imaging was collected between attacks (migraineurs) and during out-of-bout phases (CH). Data were post-processed using FreeSurfer version 6.0 and within-group correlations between hypothalamic region volume with cortical thickness were explored using a whole-brain vertex-wise linear model approach. Between-group differences in correlation slopes between hypothalamic region volume and vertex-by-vertex measurements of cortical thickness were interrogated using post-hoc comparisons.
RESULTS: There were no significant between-group differences (migraine vs CH; migraine vs HC; or CH vs HC) for age, sex, total brain volume or volume of the left or right hypothalamic region. For each group, there were significant positive correlations (P < .01) between right and left hypothalamic region volumes with…
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