Relationship between the Concentration of Supplemental Oxygen and Signal Intensity of CSF Depicted by Fluid-Attenuated Inversion Recovery Imaging
Flávio T. Bragaa,c,
Antônio J. da Rochaa,c,
Guinel Hernandez Filhoa,c,
Renê K. Arikawaa,
Ivone M. Ribeirob and
Ricardo B. Fonsecac
a Section of Radiology, Santa Casa de Misericórdia de São Paulo, Brazil
b Section of Anesthesiology, Santa Casa de Misericórdia de São Paulo, Brazil
c Section of Radiology, Fleury Centro de Medicina Diagnóstica, Brazil
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FIG 1. FLAIR images of a healthy volunteer breathing room air show the expected suppression of the SI of the CSF in the cerebral sulci, fissures, and most of the cisterns.
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FIG 2. FLAIR images of the same healthy volunteer as in Figure 1 breathing 100% O2 show hyperintensity in the cerebral sulci, fissures, and cisterns. There is no hyperintensity in the third and lateral ventricles.
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FIG 3. 78-year-old female patient evaluated for suspected normal pressure hydrocephalus.
A and B, MRI FLAIR sequence (1.0 T, TR 11,000 ms, TE 140 ms, TI 2,600 ms) shows dilatation of the ventricles and Sylvian fissures.
C and D, FLAIR after 100% O2 for 5 minutes shows increased SI in the sulci and in the posterior aspects of both Sylvian fissures, allowing visualization of hypointense cysts (arrows) due to neurocysticerosis more anteriorly within the Sylvian fissures. Note that there is no increase in the SI of the CSF within the ventricles.
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FIG 4. 51-year-old male patient with headache.
A and B, FLAIR image shows a large cyst with a scolex in the right Sylvian fissure and a cyst in the suprasellar cistern on the right, which are consistent with neurocysticerosis. The presence of an additional cyst in the perimesencephalic cisterns could not be ruled out due to prominence of these cisterns.
C and D, FLAIR after 100% O2 shows increased SI in the sulci and basal cisterns, confirming the absence of cysts in the perimesencephalic cisterns. In addition, there was improvement in the visualization of the cyst in the right suprasellar cistern and its relationship to the M1 segment of the ipsilateral middle cerebral artery.
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