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T2-weighted MR images demonstrating collateral edema caused by the DBS electrode insertion at the cortical (left panel; rating 5; patient 7) and subcortical levels (right panel; rating 3.5; patient 8). The edema appears as hyperintensity (indicated by arrows), while the DBS electrode artifacts are hypointense. MR — magnetic resonance; DBS — deep-brain stimulation; L — left and R — right.
