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Right-sided temporal grade II astrocytoma (Left column) preoperative navigation 3D FLAIR MRI sequence (1.5-Tesla MRI scanner) (Right column) pre-resectional 3D IOUS image fused with navigation FLAIR MRI sequence. Note that the hyperechoic tumor tissue is better visualized on IOUS image comparing to MRI. 3D, three-dimensional; FLAIR, fluid attenuated inversion recovery; MRI, magnetic resonance imaging; IOUS, intraoperative ultrasound.
