title: Imaging of the optic chiasm and retrochiasmal visual pathways.
abstract: The exploration of the chiasmal and retrochiasmal visual pathways is based on magnetic resonance imaging. A bitemporal hemianopsis suggests a lesion of the optic chiasm while homonymous lateral hemianopsis should lead to a search for a lesion of the retrochiasmal visual pathways. The causes of chiasmal impairment are mainly tumoral. The exploration protocol is based on MRI with T1-weighted sagittal sections, then T2- and T1-weighted coronal sections with and without injection. In case of a retrochiasmal syndrome, the MRI exploration protocol is a function of the type of occurrence of the deficiency and the context.
authors.affiliation: Service de Neuroradiologie, Hôpital Gui-de-Chauliac, CHRU de Montpellier, 80, avenue Augustin-Fliche, 34295 Montpellier cedex 5, France. Electronic address: nicolasdechampfleur@orange.fr.
authors.forename: N
authors.initials: N
authors.lastname: Menjot de Champfleur
authors.forename: S
authors.initials: S
authors.lastname: Menjot de Champfleur
authors.forename: D
authors.initials: D
authors.lastname: Galanaud
authors.forename: N
authors.initials: N
authors.lastname: Leboucq
authors.forename: A
authors.initials: A
authors.lastname: Bonafé
mesh_terms: D003937:Diagnosis, Differential; D004292:Dominance, Cerebral / Q000502:physiology; D006423:Hemianopsia / Q000175:diagnosis / Q000209:etiology / Q000473:pathology; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D009897:Optic Chiasm / Q000473:pathology* / Q000601:surgery; D009901:Optic Nerve Diseases / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D019574:Optic Nerve Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D058609:Visual Field Tests; D014794:Visual Fields / Q000502:physiology; D014795:Visual Pathways / Q000473:pathology* / Q000601:surgery
keywords: Brain; Cranial nerves; MRI; Orbits