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Fig. 4E —Meningioma in 7-year-old boy. Lateral shaded-surface view of 3D RA with spherical volume measurement (green). Internal carotid artery (arrows) and superficial temporal branch of external carotid artery (arrowheads) are shown. Three-dimensional RA enables neurosurgical team to delineate ideal surgical approach that would identify middle cerebral artery branches at risk before encountering them in operating suite.