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Volume Conduction; Left Functional Hemispherectomy. A 2-year-old-left-handed boy with a history of life-threatening seizures resulting from left hemimegalencephaly associated with linear sebaceous nevus syndrome. He underwent emergency left functional hemispherectomy at 7 days of age and has been free of disabling seizures since. MRI shows postoperative change. EEG shows nearly continuous sharp waves in the left frontal-temporal region superimposed on marked background suppression in the left hemisphere. Background EEG activity is normal in the right hemisphere. There are periodic sharp waves of lower amplitude in the right frontal-temporal (arrows) timed-locked with the homologous sharp waves in the left hemisphere. These sharp waves are most likely due to volume conduction of electrical discharges from the homologous region in the left hemisphere passing through the skin to the Source: Focal Nonepileptoform Activity, Atlas of Pediatric EEG right frontal-temporal region as the propagating pathway through the corpus callosum has been eliminated by the surgery. This is another example of EEG Atlas67of Pediatric EEG; 2011 Available at: http://mhmedical.com/ Accessed: June 10, 2017 application ofCitation: volume Laoprasert conduction P. theory. Copyright © 2017 McGraw-Hill Education. All rights reserved