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FIG. 4. Right frontal recurrence of an oligodendroglioma. The difference in signal intensity between CSF and cystic content is probably attributable to protein debris, typical of neoplastic lesions. This feature is evident on all sequences but is more obvious with the FLAIR sequence. With this pulse sequence, both the neoplastic tissue and peritumoral edema are appreciated more easily considering the saturation of the CSF signal in the sulci.
A, T1-weighted image. The cystic content (arrow) is slightly hyperintense in comparison with CSF (in the cortical sulci).
B, T2-weighted image. The neoplastic cystic content (arrow) has an elevated signal intensity in comparison with CSF.
C, PD-weighted image. The cystic content signal intensity is slightly hyperintense (arrow) in comparison with CSF.
D, FLAIR pulse sequence. The cystic content (arrow) shows an elevated signal intensity.
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