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AJNR Am J Neuroradiol. 2008 May;29(5):863-4. doi: 10.3174/ajnr.A1027. Epub 2008 Feb 29.

Decreased diameter of the optic nerve sheath associated with CSF hypovolemia.

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  • 1Department of Neurosurgery, Faculty of Medicine, University of Yamanashi, Chuo, Yamanashi, Japan.


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.

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