Intraoperative demonstration of a check-valve mechanism in a spinal extradural arachnoid cyst with nerve root incarceration
Abstract Spinal extradural arachnoid cysts (SEDACs) are rare lesions thought to arise from a dural defect associated with a check-valve mechanism, although direct intraoperative evidence is limited. We report a 17-year-old female presenting with persistent low back pain and bilateral lower extremity numbness. Magnetic...