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Right-sided insular grade II astrocytoma. Visualization of the tumor before the resection using 12 MHz linear IOUS probe co-registrated with preoperative navigation 3D FLAIR MRI sequence. Note co-registration with navigation MRI facilitates anatomical orientation. 3D, three-dimensional; FLAIR, fluid attenuated inversion recovery; MRI, magnetic resonance imaging; IOUS, intraoperative ultrasound.
