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Post-operative pseudomeningocele with nerve root tethering. Sagittal FIESTA-C MRI image (a) shows a dural defect (arrow) and adjacent pseudomeningocele at the site of prior L4-5 laminectomy. Axial FIESTA-C MRI images (b–c) There is tethering and herniation of traversing sacral nerve roots (asterisk) through the dural defect. A subdural effusion with displacement of the arachnoid membrane (arrow) is also present.
