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In glioma surgeries, cognitive outcomes for the dominant hemisphere have gained much attention compared to the non-dominant hemisphere. For non-dominant hemispheric glioblastomas, we previously observed decreased independence level following glioblastoma resection of the posterior temporal to the parietal lobes. Here, we investigated the reason for the poor Karnofsky Performance Status (KPS) in such glioblastomas. A total of 41 patients with resection of the right cerebral hemispheric primary glioblastoma were enrolled for the study. Several kinds of neuropsychological functions and KPS of the brain regions were evaluated at pre- and postoperative 3 months by performing the Spearman’s correlation analysis and voxel-based lesion symptom mapping (VLSM). Additionally, the correlation between the resected volume of each gyrus or white matter tract and neuropsychological function score was analyzed. KPS at chronic phase (73.6) declined significantly compared with preoperation (81.0, p = 0.020). Functional factors influencing the KPS were general cognitive function, visuospatial cognition, emotion recognition, executive function, and apathy. The VLSM analysis revealed that the resection of the ventral parietal lobe and supramarginal gyrus (VPL-SMG) resulted in significantly poor KPS. Among the functional factors affecting KPS, VPL-SMG resection contributed to significantly lower scores in visuospatial cognition, emotion recognition, and apathy than those without resection (p = 0.0045, 0.047, and 0.0002, respectively). Further, we investigated whether the damage of the VPL-SMG could result in KPS related functional deficit. We found visuospatial cognition related to the posterior occipital lobe, SMG, arcuate fasciculus (AF), and dorsal superior longitudinal fasciculus, emotion recognition to the middle to inferior occipital gyrus and AF, and apathy to the inferior parietal lobe and middle temporal gyrus. We concluded that deficits of visuospatial cognition, emotion recognition, and apathy due to the damage of the cortical and white matter areas, including the VPL-SMG, were responsible for KPS of the non-dominant hemispheric glioblastomas.

NCOG-17. FACTORS INFLUENCING POOR INDEPENDENCE LEVEL FOLLOWING RESECTION OF THE RIGHT TEMPORO-PARIETAL GLIOBLASTOMAS