Usefulness of intraoperative electrical subcortical mapping during surgery for low-grade gliomas located within eloquent brain regions: functional results in a consecutive series of 103 patients.
OBJECTIVE
Although a growing number of authors currently advocate surgery to treat low-grade gliomas, controversy still persists, especially because of the risk of inducing neurological sequelae when the tumor is located within eloquent brain areas. Many researchers performing preoperative neurofunctional imaging and intraoperative electrophysiological methods have recently reported on the usefulness of cortical functional mapping. Despite the frequent involvement of subcortical structures by these gliomas, very few investigators have specifically raised the subject of fiber tracking. The authors in this report describe the importance of mapping cortical and subcortical functional regions by using intraoperative real-time direct electrical stimulations during resection of low-grade gliomas.


METHODS
Between 1996 and 2001, 103 patients harboring a corticosubcortical low-grade glioma in an eloquent area, with no or only mild deficit, had undergone surgery during which intraoperative electrical mapping of functional cortical sites and subcortical pathways was performed throughout the procedure. Both eloquent cortical areas and corresponding white fibers were systematically detected and preserved, thus defining the resection boundaries. Despite an 80% rate of immediate postoperative neurological worsening, 94% of patients recovered their preoperative status within 3 months--10% even improved--and then returned to a normal socioprofessional life. Eighty percent of resections were classified as total or subtotal based on control magnetic resonance images.


CONCLUSIONS
The use of functional mapping of the white matter together with cortical mapping allowed the authors to optimize the benefit/risk ratio of surgery of low-grade glioma invading eloquent regions. Given that preoperative fiber tracking with the aid of neuroimaging is not yet validated, we used intraoperative real-time cortical and subcortical stimulations as a valuable adjunct to the other mapping methods.
Duffau
Hugues
H
Department of Neurosurgery, Hôpital de la Salpétrière, Paris, France. hugues.duffau@psl.ap-hop-paris.fr
Capelle
Laurent
L
Denvil
Dominique
D
Sichez
Nicole
N
Gatignol
Peggy
P
Taillandier
Luc
L
Lopes
Manuel
M
Mitchell
Mary-Christine
MC
Roche
Sabine
S
Muller
Jean-Charles
JC
Bitar
Ahmad
A
Sichez
Jean-Pierre
JP
van Effenterre
Rémy
R
D000293:Adolescent; D000328:Adult; D001931:Brain Mapping; D001932:Brain Neoplasms / Q000150:complications / Q000473:pathology / Q000601:surgery; D004558:Electric Stimulation / Q000295:instrumentation; D005260:Female; D005910:Glioma / Q000150:complications / Q000473:pathology / Q000601:surgery; D006801:Humans; D007430:Intraoperative Care; D007806:Language Disorders / Q000175:diagnosis / Q000209:etiology*; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009434:Neural Pathways / Q000473:pathology; D019635:Neurosurgical Procedures / Q000295:instrumentation*; D011300:Preoperative Care; D012189:Retrospective Studies; D012720:Severity of Illness Index