Clusterlike headache as first manifestation of a prolactinoma.

We report a case of cluster headache in a patient with a macroprolactinoma. Symptomatic cluster headache was suspected because of an unsatisfactory response to medications that are usually effective in idiopathic cluster headache. The neurological examination was normal. However, magnetic resonance imaging demonstrated a large pituitary tumor. One year after starting treatment with cabergoline, the patient remains asymptomatic. Symptomatic cluster headache should be suspected when the clinical features of the headache are atypical. By inducing vascular mechanisms, the parasellar lesion may have played a role in initiating the cluster headache.