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Recovery of Visual Field After Awake Stimulation Mapping of the Optic Pathway in Glioma Patients

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Abstract

Brain mapping during awake craniotomy for gliomas can help preserve neurological functions, including maintenance of central and peripheral vision. However, the consecutive changes in the visual field remain unknown. We retrospectively assessed 14 patients who underwent awake craniotomy for gliomas infiltrating into the optic radiation. Cortico-subcortical direct electrical stimulation (DES) was intraoperatively applied until transient visual symptoms were elicited and recorded. The visual fields were examined consecutively in the preoperative period and postoperative subacute and chronic periods. To evaluate the anatomo-functional validity of the recordings, all DES-elicited points were overlaid onto a three-dimensional template that included the optic radiation, using voxel-based morphometry (VBM) mapping. All patients experienced visual symptoms that were classified as phosphenes, blurred vision, or hallucinations during DES, and surgical resection was limited to within the functional boundaries. In VBM, almost all the subcortical positive mapping points overlapped with the surface of the optic radiation, and the distribution of sites that induced visual phenomena in the upper or lower visual fields could be differentiated in the anatomical space. We observed no postoperative visual deficit in four patients (29%), time-dependent improvements in five out of eight patients that presented transient quadrantanopia or partial visual defect (36% out of 57%), and permanent hemianopsia (14%) in two patients with occipital lesions. Intraoperative DES that identifies and preserves optic radiation in awake craniotomy for gliomas is a reliable and effective technique to reduce risk of permanent deficits, but has a low success rate in patients with occipital involvement.

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Data will be made available on reasonable request.

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Abbreviations

DES:

Direct electrical stimulation

DTI:

Diffusion tensor imaging

DWI:

Diffusion weighted imaging

FLAIR:

Fluid-attenuated inversion recovery

MRI:

Magnetic resonance imaging

QOL:

Quality of life

VEP:

Visual evoked potential

3D:

Three-dimensional

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Funding

This work was supported by the JSPS KAKENHI (20K17923 to TI, and 20K09385 to MK).

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Authors

Contributions

T.I. and M.K. wrote the main manuscript text and all figures. All authors reviewed the manuscript.

Corresponding author

Correspondence to Masashi Kinoshita.

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Competing interests

The authors report no competing interests.

Ethics Approval

The approval for this study was granted by the Medical Ethics Committee of Kanazawa University (2020–032 [3359]).

Consent to Participate

Written informed consent for the use of the patient’s images was obtained from all patients in this study.

Consent to Publication

Written informed consent for the use of the patient’s images was obtained from all patients in this study.

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Handling Editor: Christoph Michel.

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Ichinose, T., Kinoshita, M., Nakajima, R. et al. Recovery of Visual Field After Awake Stimulation Mapping of the Optic Pathway in Glioma Patients. Brain Topogr 36, 87–98 (2023). https://doi.org/10.1007/s10548-022-00922-z

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  • DOI: https://doi.org/10.1007/s10548-022-00922-z

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