title: Ophthalmic segment aneurysmal subarachnoid hemorrhage presenting with contralateral abducens nerve palsy: a false localizing sign.
abstract: BACKGROUND
  Neuro-ophthalmic manifestations of aneurysmal subarachnoid hemorrhage are commonly linked to a palsy of the cranial nerve in close proximity to the aneurysm or to chronic intracranial hypertension.
  
  
  METHODS
  A patient with subarachnoid hemorrhage secondary to a rupture of an intracranial right ophthalmic segment internal carotid artery aneurysm presented with an acute-onset contralateral abducens nerve palsy. There were no clinical or radiologic features of chronic intracranial hypertension. Magnetic resonance imaging showed a co-existent ectatic basilar artery on the left side of the pons in close relation to the sixth nerve.
  
  
  CONCLUSIONS
  Abducens weakness in the above-50 age group is most commonly caused by a vascular etiology. The authors discuss the pathogenesis of this rare clinical entity and present pertinent literature review.
authors.affiliation: Department of Neurosurgery, Sri Sathya Sai Institute of Higher Medical Sciences, EPIP Area, Whitefield, Bangalore, Karnataka State, India. sunilvf@gmail.com
authors.forename: Sunil V
authors.initials: SV
authors.lastname: Furtado
authors.forename: Dilip
authors.initials: D
authors.lastname: Mohan
authors.forename: Alangar S
authors.initials: AS
authors.lastname: Hegde
mesh_terms: D020434:Abducens Nerve Diseases / Q000209:etiology* / Q000473:pathology; D001488:Basilar Artery; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D013345:Subarachnoid Hemorrhage / Q000150:complications* / Q000473:pathology