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