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AJNR - American Journal of Neuroradiology

Published ahead of print on February 29, 2008
doi: 10.3174/ajnr.A1027

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American Journal of Neuroradiology 29:863-864, May 2008
© 2008 American Society of Neuroradiology

Case Report
HEAD & NECK

Decreased Diameter of the Optic Nerve Sheath Associated with CSF Hypovolemia

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

^a Department of Neurosurgery, Faculty of Medicine, University of Yamanashi, Chuo, Yamanashi, Japan
^b Department of Radiology, 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.