Abstract
Different electrical current polarity is used to identify motor function during brain tumor resection. We report a case of a 54-year-old patient with prior history of right sensorimotor glioma resection followed by radiation and chemotherapy. Focal motor seizures, due to tumor recurrence eight years later, led to chemotherapy and a second surgery. Motor mapping around tumor cavity boundaries was performed using a handheld probe after N20 phase reversal central sulcus identification. Anodal and cathodal current was used in search of the lowest intensity to obtain the greatest hand muscle motor evoked potential (MEP). Subcortical mapping anatomically 15 mm beneath the cortex showed a MEP of higher amplitude and lower MEP threshold after delivering anodal current in comparison with cathodal current. Subcortical motor axon depolarization using anodal (instead of cathodal) current may activated neuron cell bodies, more prone to receive electrical current rather than the tracts.
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