Abstract
Cluster headache is one of the most debilitating primary headache syndromes, defined as a strictly unilateral severe headache, associated with autonomic symptoms and a circadian and circannual pattern.1,2 About 10% of these patients develop a chronic type, which has an even greater impact on patients’ quality of life.3 Patients often fail to obtain relief from conventional medical management (CMM) and minimal invasive steroid injections on occipital nerve or sphenopalatine ganglion.4 As a last resort, these patients can be treated with occipital nerve stimulation (ONS) but this technique is prone to technical failure and infection.
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