title: Intra-operative mapping of the subcortical visual pathways using direct electrical stimulations.
abstract: Despite the risk of postoperative visual field defect following surgery within the temporo-parieto-occipital region, visual mapping has rarely been described, in particular at the subcortical level. In this report, we successfully performed a subcortical mapping of the visual pathways using intra-operative electrical stimulations (IES), during surgery under local anesthesia for a low-grade glioma invading the whole temporal lobe and the temporo-occipital junction. The optic radiations then constituted the posterior and deep functional boundary of the resection, avoiding the occurrence of a post-operative hemianopsia, in spite of an asymptomatic quadrantanopsia. This preliminary experience illustrates the possibility to use intra-operative direct electrical stimulation during surgery of lesions involving the posterior afferent visual system, in order to identify and then preserve the visual pathways, as previously reported for sensorimotor and language subcortical fibers.
authors.affiliation: Department of Neurosurgery, Hôpital de la Salpêtrière, 47-83 Boulevard de l'Hôpital, 75651 Paris Cedex 13, France. hugues.duffau@psl.ap-hop-paris.fr
authors.forename: H
authors.initials: H
authors.lastname: Duffau
authors.forename: S
authors.initials: S
authors.lastname: Velut
authors.forename: M-C
authors.initials: MC
authors.lastname: Mitchell
authors.forename: P
authors.initials: P
authors.lastname: Gatignol
authors.forename: L
authors.initials: L
authors.lastname: Capelle
mesh_terms: D000328:Adult; D001931:Brain Mapping / Q000379:methods*; D001932:Brain Neoplasms / Q000473:pathology / Q000503:physiopathology / Q000601:surgery*; D002540:Cerebral Cortex / Q000473:pathology / Q000503:physiopathology / Q000601:surgery*; D004558:Electric Stimulation / Q000379:methods; D005260:Female; D005910:Glioma / Q000473:pathology / Q000503:physiopathology / Q000601:surgery*; D006423:Hemianopsia / Q000517:prevention & control; D006801:Humans; D014795:Visual Pathways / Q000503:physiopathology*