A, Sagittal T2WI MR image demonstrates a typical intraspinal extramedullary arachnoid cyst. A, Sagittal T2WI MR image demonstrates a typical intraspinal.

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A, Sagittal T2WI MR image demonstrates a typical intraspinal extramedullary arachnoid cyst. A, Sagittal T2WI MR image demonstrates a typical intraspinal extramedullary arachnoid cyst. Superior and inferior aspects of the cyst are delineated by the arrow and arrowhead, respectively. B and C, Sagittal and axial CT myelograms show how the arachnoid cyst fills more slowly than the CSF after intrathecal contrast injection. M.A. Reardon et al. AJNR Am J Neuroradiol 2013;34:1104-1110 ©2013 by American Society of Neuroradiology