One of the complications occurring after surgery, meningitis, subarachnoid hemorrhage, and Pantopaque myelography is the development of arachnoiditis. Morphologic signs of arachnoiditis include clumping of the nerve roots within the thecal sac with the creation of an intradural pseudomass. Adhesion of individual nerve roots to the inner margins of the arachnoid mater gives the appearance of an empty thecal sac. Endnote The intradural cysts can be difficult to detect if their contents have signal characteristics similar to those of CSF. If their protein content is increased, T1 shortening results in increased signal on T1-weighted images. Damping of CSF pulsations may become apparent on gradient-echo or T2-weighted sequences.  

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