Abstract
Dorsal arachnoid web is a rare entity, which was rst reported by Malleci et al in 1997.It represents intradural, extramedullary band of arachnoid tissue that extends to the pial surface of the spinal cord which blocks the cerebrospinal uid ow in the longitudinal direction and widens the dorsal cerebrospinal uid space associated with increased pressure of the cerebrospinal uid & a local mass effect, resulting in the dorsal indentation and anterior displacement of the cord to cause myelopathy. Dorsal arachnoid web typically occurs in the upper thoracic spine
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