title: Acute visual loss in an orbital arteriovenous malformation.
abstract: Arteriovenous malformations (AVMs) of the orbit are rare and are thought to be congenital. They can grow slowly or in a delayed fashion after a prolonged period of quiescence if there is a hemodynamic balance between the in-flow and the out-flow vessels. However, once the balance is destroyed, orbital AVMs may cause acute visual deterioration. We report a 17-year-old male with orbital AVM, and discuss the mechanism and the management of acute visual deterioration in this setting. Angiography revealed an orbital AVM with obvious drainage obstruction and serious orbital congestion, due to the disruption of the balance. He had no vision improvement although treated successfully with radical transarterial embolization. The worsening of drainage obstruction could alter the hemodynamic flow and lead to acute visual deterioration. Early and exact diagnosis and complete transarterial embolization therapy are important before the hemodynamic imbalance.
authors.affiliation: Department of Neurosurgery, Third Military Medical University, Chongqing, China.
authors.forename: Yin
authors.initials: Y
authors.lastname: Niu
authors.forename: Hongping
authors.initials: H
authors.lastname: Miao
authors.forename: Gang
authors.initials: G
authors.lastname: Zhu
authors.forename: Zhi
authors.initials: Z
authors.lastname: Chen
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D002533:Cerebral Angiography; D002560:Cerebrovascular Circulation; D004621:Embolization, Therapeutic; D006801:Humans; D006940:Hyperemia / Q000150:complications* / Q000000981:diagnostic imaging / Q000628:therapy*; D002538:Intracranial Arteriovenous Malformations / Q000150:complications* / Q000000981:diagnostic imaging / Q000628:therapy*; D008297:Male; D014786:Vision Disorders / Q000209:etiology*