Patients with cluster headaches may develop ipsilateral Horner syndrome during an acute attack. The term Raeder paratrigeminal syndrome has been used to describe patients, usually middle-aged males, who have Horner syndrome and daily unilateral head pain. Pain related to Raeder syndrome can be distinguished from that of cluster headaches or carotid disease in that these conditions occur without impairment of trigeminal nerve function. Sixth nerve palsy and unilateral Horner's syndrome. Medicine is a constantly changing science and not all therapies are clearly established.
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