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(a) Sagittal T1-W MRI without contrast injection, before the first surgery. An extradural hyposignal lesion is observed at S1–S3 level, which was neglected in the first intervention. (b) Sagittal T1 MRI with contrast from the lumbosacral region after the first operation. Homogenous enhancement of the lesion is observed. (c and d) Axial T1 MRI views of the lesion with and without contrast, after the first operation
