γ knife stereotactic radiosurgery in the management of cluster headache.

Gamma knife stereotactic radiosurgery (SRS) has proven to be an effective management approach for trigeminal neuralgia and as a minimally invasive alternative management option for cluster headache (CH). In CH, patients undergo single-session focused irradiation of the trigeminal nerve root (TN), sometimes coupled with irradiation of the sphenopalatine ganglion (SPG) as well. SRS provides early pain relief in most patients, but is associated with trigeminal sensory dysfunction in some patients. In the future, a prospective trial that compares a single target of TN to dual targets of both the TN and SPG may provide further understanding of the value of SRS for CH.