• Neurosurgery · Oct 2006

    Case Reports

    Utility of preoperative magnetic resonance imaging myelography for identifying dural defects in patients with spinal extradural arachnoid cysts: case report.

    • Michiyuki Miyamoto, Kyongsong Kim, Ryoji Matsumoto, Masanori Isobe, and Toyohiko Isu.
    • Department of Neurosurgery, Kushiro Rosai Hospital, Kushiro, Japan. miyamich@med.hokudai.ac.jp
    • Neurosurgery. 2006 Oct 1; 59 (4): E941; discussion E941.

    ObjectivePreoperative magnetic resonance imaging (MRI) myelography scans demonstrated a dural defect in a 50-year-old man with an epidural arachnoid cyst who had a 29-year history of untreated weakness and numbness both lower limbs.MethodsMRI scans showed a dorsal intraspinal extradural cystic lesion at the level from Th11 to L1. Although preoperative cine-MRI scans failed to display the dural defect, an MRI myelography scan showed cerebrospinal fluid in the subarachnoid space containing a cyst.ResultsThe site of shunting between the subarachnoid space and the cyst was visualized as a pulsating flow void to the right of Th12. We removed the cyst wall and closed the dural defect via laminectomy.ConclusionBecause the preoperative MRI myelography scan correctly identified the existence and location of the dural defect, we conclude that MRI myelography is helpful for detecting dural defects in patients with epidural arachnoid cysts.

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