Extradural arachnoid cysts in the spine are rare and are seldom a cause of spinal cord compression. They are thought to arise from congenital defects in the dura mater, and they almost always communicate with the intrathecal subarachnoid space through a small defect in the dura.
Submitted by Dr Sangeeta Aneja, MD Head of Dept, LLRM Meerut
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