Dorsal Arachnoid Web in Thoracic Spine: A Case Report

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