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Preoperative and intraoperative imaging. (a and b) Sagittal T1- and T2-weighted MRI showing a dorsal T11 intradural extramedullary tumor. (c) Axial T2-weighted MRI showing severe spinal cord compression. (d) Intraoperative ultrasonography showing a well-defined, multicystic dorsal lesion. MRI: Magnetic resonance imaging.
