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A 48-year-old woman presented with a 6-month history of lumbosacral pain with sciatic distribution and paresthesia in the left S1 dermatome. She showed no motor weakness or bladder or rectal dysfunction. The preoperative magnetic resonance image (MRI) of the lumbar spine showed an intradural, extramedullary cystic mass extending along the left S1 nerve root through the intervertebral foramen (Figure 1). The patient underwent microscope-assisted neurosurgical tumor resection via a lumbar posterior approach. Intraoperatively, the tumor was regarded as a peripheral nerve sheath tumor.
Tiebel N, Lichota A, Scharbrodt W, Foerster A, Toedt C, Reifenberger G, Malzkorn B. Intradural, Extramedullary Anaplastic Astrocytoma Arising From the First Sacral Nerve Root. JAMA Neurol. 2013;70(11):1450-1451. doi:10.1001/2013.jamaneurol.368