PMC6369119_01
A: Preoperative MRI demonstrating the left occipital subcortical infarct and associated AVM. B: Reconstructed three-dimensional cortical montage with overlay of electrocorticography grids. Stimulation contact pairs are highlighted on the left occipital grid. C: Representative illustration of the patient's visual fields with dots in the lower right quadrant representing phosphenes from stimulation across contacts 2-10 and 3-11. The dot in the blind upper right quadrant represents phosphenes generated from stimulation across contacts 4 and 12.
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Video-EEG monitoring demonstrated left basal-temporal origin and MRI demonstrated the AVM and surrounding changes in the posterior temporal lobe and temporal-occipital regions including the optic radiations, but sparing primary visual cortex (Fig. 1). Electrodes placed included a 16 contact array (Ad-Tech, Racine, Wisconsin, USA) of 4 mm diameter platinum contacts with 1 cm center-to-center spacing over the surface of the medial occipital lobe (Fig. 1).