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FIG 2. A 57-year-old man with multiple vesicular lesions in the brain parenchyma.
A, FLAIR image shows prominent CSF space along the cerebral convexities.
B, FLAIR image after 100% O2 for 5 minutes does not show the expected increased signal intensity of the CSF due to the presence of multiple clustered extraaxial cysts. The walls of the cysts (arrows) are better visualized after 100% O2.
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