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Spinal extradural arachnoid cysts are thought to be extradural arachnoid pouches that communicate with the intraspinal subarachnoid space through a small dural defect. The mainstay of current treatment is resection of the cyst wall followed by obliteration of the communicating pedicle. Despite its clinical importance, the communicating pedicle of the cyst is often elusive. The authors report a 57-year-old...