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AJNR - American Journal of Neuroradiology

Publication Preview: Published February 29, 2008

American Journal of Neuroradiology 2008;29:863.

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American Journal of Neuroradiology
DOI 10.3174/ajnr.A1027

HEAD & NECK

Decreased Diameter of the Optic Nerve Sheath Associated with CSF Hypovolemia

A. Watanabe, T. Horikoshi, M. Uchida, K. Ishigame and H. Kinouchi

From the Departments of Neurosurgery (A.W., T.H., M.U., H.K.) and Radiology (K.I.), Faculty of Medicine, University of Yamanashi, Chuo, Yamanashi, Japan.

Please address correspondence to Arata Watanabe, Department of Neurosurgery, Faculty of Medicine, University of Yamanashi, 1110 Shimokato, Chuo, Yamanashi 409-3898, Japan; e-mail: arata{at}yamanashi.ac.jp

SUMMARY: The subarachnoid space around the optic nerve can be detected by fat-saturated T2-weighted MR imaging of the orbit, and dilation of this space reflects increased intracranial pressure. We examined 3 patients with CSF hypovolemia with MR imaging of the orbit and measured the optic nerve sheath diameter before and after treatment. We showed that the subarachnoid space is decreased in patients with CSF hypovolemia and the usefulness of this finding.