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Fig. 4. —Ganglioglioma in 1-year-old boy with left hemiparesis. Contrast-enhanced T1-weighted axial MR image shows predominantly cystic enhancing mass in right hemisphere. Tumor shown was largest in study, measuring 242 cm³. Note that right hemicranium is enlarged relative to left hemicranium because tumor growth occurred while cranial sutures were not yet fused. This factor may explain mass effect being less than expected on adjacent brain (and fewer neurologic deficits) than if sutures had been fused, which permitted tumor to attain large size before diagnosis.