A, Sagittal T2WI MR image demonstrates a focal dorsal indentation (arrow) in the thoracic spinal cord. A, Sagittal T2WI MR image demonstrates a focal dorsal.

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Presentation transcript:

A, Sagittal T2WI MR image demonstrates a focal dorsal indentation (arrow) in the thoracic spinal cord. A, Sagittal T2WI MR image demonstrates a focal dorsal indentation (arrow) in the thoracic spinal cord. B, Intraoperative image after opening of the dura demonstrates an intradural white arachnoid band (between arrowheads) passing transversely across and compressing the dorsal surface of the spinal cord. C, Intraoperative image of the cord after the band of arachnoid tissue has been cut. The position is marked by arrowheads. M.A. Reardon et al. AJNR Am J Neuroradiol 2013;34:1104-1110 ©2013 by American Society of Neuroradiology