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FIG 2. Right CPA epidermoid tumor in a 72-year-old man.
A-C, Contrast-enhanced T1-weighted (400/8/2 [TR/TE/excitations]) (A), fast T2-weighted (3000/98/2) (B) and proton density–weighted (3000/14/2) (C) images do not show the epidermoid tumor but only slight expansion of the arachnoid cistern in the right CPA (arrow).
D, Fast-FLAIR imaging (10002/148/1, inversion time of 2200) shows the tumor (arrows) as unevenly hyperintense relative to the CSF but hypointense relative to the brain.
E, Echo-planar DW imaging (1600/126 [TR/TE] with b value of 1000 s/mm2; field of view, 24 x 24 cm) reveals the tumor as a sharply hyperintense lesion (arrows) relative to the brain and CSF.
F, ADC map shows that the intensity of the tumor is similar to that of surrounding brain tissue but much different from that of CSF. Note the uneven diffusion in the lesion (arrows).
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