Raeder's syndrome associated with intracranial internal carotid artery aneurysm

Raeder's syndrome consists of oculosympathetic paresis and ipsilateral facial pain, with variable involvement of the trigeminal and oculomotor nerves. A 63-year-old woman experienced severe facial pain, a partial Horner's syndrome, and restriction of ocular movements on the left side. A left carotid angiogram disclosed a giant aneurysm of the cavernous portion of the internal carotid artery. This is the third reported case of Raeder's syndrome due to aneurysm of the intracranial internal carotid artery. Her facial pain was relieved by carotid ligation, and serial computed tomographic scans showed decrease of aneurysmal size.