J Korean Neurol Assoc.
2015 Feb;33(1):26-28.
Hyperintensity of Subarachnoid Space on FLAIR Images Caused by Supplemental Oxygen
- Affiliations
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- 1Department of Neurology, Presbytarian Medical Center, Seonam University College of Medicine, Jeonju, Korea.
- 2Department of Neurology, Chonnam National University Hospital, Chonnam National University Medical School, Gwangju, Korea. neurologist16@gmail.com
- 3Department of Neurology, Daegu Catholic University Hospital, Daegu, Korea.
Abstract
- A hyperintensity in the subarachnoid space on fluid-attenuated inversion-recovery (FLAIR) images is often caused by diseases such as subarachnoid hemorrhage or meningitis. Oxygen has a known paramagnetic effect and also causes signal changes in the subarachnoid space on FLAIR images. These changes usually develop when the inspired air contains a high oxygen fraction. Here we present a patient with a hyperintensity in the subarachnoid space on FLAIR images whose inspired air contained only a low oxygen fraction.
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