The spectrum of cluster headaches: a case report.

Cluster headache and chronic paroxysmal hemicrania are two syndromes which, although sharing many characteristics, are coded separately under the International Headache Classification system. I report a patient who, over a 15 year period presented at sometime or other, many features of these two syndromes. Rather than continuously reclassifying the patient's diagnosis according to the characteristics of individual attacks, I propose that such patients be categorized as having a "cluster spectrum disorder", at least until biological markers point to the contrary.