Resting State Functional Connectivity in Cluster Headache

Cluster headache is a highly disabling primary headache disorder, characterized by severe, excruciating, recurrent unilateral headache attacks. Typically, attacks' onset displays a circadian rhythm, and bout recurrence happens in a circannual fashion. Notably, the mechanisms underlying the shift between the remission phase and cluster bout are poorly understood. Thus, the investigators aim to study brain connectivity in episodic cluster headache patients. Additionally, an explorative analysis of functional connectivity in chronic cluster headache patients will be performed.