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Fig 4. Axial conventional images and perfusion maps obtained with CASL and T2DSC in a 49-year-old patient with frontal falx meningioma (patient 6). A, T2-weighted image. B, T1-weighted image. C, Post-Gd T1-weighted image. D, CASL perfusion-weighted image (rCBF map). E, T2DSC perfusion image (rCBF map). The tumor shows slightly higher signal intensity than the cortex as well as good enhancement on T2-weighted and post-Gd T1-weighted-images, respectively. Note that the posterior aspect of tumor revealed very low signal intensity on T2-weighted images, corresponding to hemorrhagic change, which was also confirmed by CT imaging during the same period. The hyperperfusion signal intensity is apparent on perfusion maps obtained with CASL and T2DSC. F, HE-stained sections (x100) from the same case. The fibrous subtype of meningioma was confirmed on histologic examination. Microvessels are very scantly scattered in the specimen.
