Watch a detailed medical case presentation from Johns Hopkins pediatric neurosurgery director Alan Cohen as he discusses the diagnosis and surgical treatment of a 12-year-old patient with a rare ganglioglioma brain tumor. Follow the journey from initial emergency room presentation following a generalized seizure through the diagnostic process revealing a left parietal lobe tumor. Learn about the sophisticated surgical approach using frameless stereotactic guidance and intraoperative MRI to remove this WHO grade 1 benign tumor that had created pressure significant enough to scallop the overlying skull from its origin in the cerebral cortex.