Figure 5: Preoperative axial MRI scan. (A) A metastasis interfacing the optic radiation with a postoperative scan; (B) resection. (C) The tumor is nested between the parieto-occipital and calcarine sulci. (D) The tumor was removed with the use of a NTR (double arrow) to avoid retraction injury and the collision technique in addition to standard visual evoked potentials. The patient had no visual field defect postoperatively. ©George Samandouras 2022. MRI: Magnetic resonance imaging. NTR: navigated tubular retractor