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Horner's Syndrome Caused by Internal Carotid Artery Collapse after Clipping of an Internal Carotid-Posterior Cerebral Artery Aneurysm.

A 59-year-old woman presented with left blepharoptosis after clipping for treatment of subarachnoid hemorrhage from a ruptured internal carotid-posterior cerebral artery aneurysm. Neuro-ophthalmological examination revealed postganglionic Horner?s syndrome on the left side associated with left optic tract syndrome. The left optic tract near the aneurysm was damaged directly or indirectly as a result of ischemic insult during the clipping procedure. Aneurysmal rupture during clipping procedures could lead to extracranial internal carotid artery collapse and occlusion, causing ischemic damage to the sympathetic plexus.

Author(s): Chuman Hideki*, Nao-i Nobuhisa, Tamura Koichiro