Psuedoaneurysm within the cavernous sinus presenting as cluster headache.

Cluster headache and its associated signs and symptoms have been described in medical literature for years. The etiology of this condition remains unresolved. We describe a unique patient who presented with a cluster headache syndrome concurrent with new-onset pseudoaneurysm within the cavernous sinus. Our review and analysis of this patient confirms current theories which describe the role of the cavernous sinus as a locus of pathology in cluster headache.