OBJECTIVE AND IMPORTANCE: Gangliogliomas are intra-axial, avascular masses located predominately in the temporal lobe. A ganglioglioma that mimics a meningioma in that it is extra-axial and has a significant extracranial vascular supply has not been reported previously. CLINICAL PRESENTATION: A 12-year-old girl presented with a right temporoparietal mass. A neurological examination revealed nothing abnormal, and the girl's symptoms were limited to headaches. INTERVENTION: Magnetic resonance imaging revealed an extra-axial mass, and cerebral catheter angiography revealed a blood supply mainly from the posterior division of the right middle meningeal artery. Intraoperative findings confirmed the extra-axial location of the tumor, and histological analysis revealed that the tumor was a ganglioglioma. CONCLUSION: This report confirms that gangliogliomas can present as extra-axial, vascular masses that are similar to meningiomas.
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