Magnetic resonance imaging (MRI) scan of the brain with the glioblastoma multiforme (GBM) tumor. The image highlights the three study zones: (1) peritumoral area, (2) enhancing tumor region and (3) tumor core. Axial, T1-weighted MRI scans of a 64-year-old patient diagnosed with GBM in the right parietal lobe. The patient presented visual impairment in the left eye and visual-spatial coordination disorders, as well as a sensory impairment on the right side.