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FIG 3. Left temporal glioblastoma.
A, T1-weighted sequence. The tumor has a central part (arrow) with a dyshomogeneous but mostly hyperintense signal in comparison with cysternal and ventricular CSF.
B, T2-weighted image. The solid part of the tumor (arrowhead) is hypointense, and the necrotic part (arrow) and perilesional edema are hyperintense, similar to CSF. The region of interest was taken from the central, necrotic part (arrow) in all the images.
C, PD-weighted image. Necrosis (arrow) is easily distinguished from the solid neoplastic tissue (arrowhead) but with less resolution than that achieved using the T2-weighted image. The necrotic area appears slightly hyperintense in comparison with CSF.
D, FLAIR sequence. Both the necrotic tissue (arrow) and perilesional edema remain hyperintense. The tumor tissue (arrowhead) remains hypointense and the necrotic material (arrow) is highly hyperintense, whereas CSF has a low signal.
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