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MRI scans showing a typical response of a recurrent GBM to bevacizumab. The image on the right shows the tumor-associated enhancement (large arrow) and accompanying compression of the ventricle by mass effect (small arrow). The image on the right shows the same region following a one month course of bevacizumab. Note the marked reduction in contrast enhancement and mass effect.
Abbreviations: GBM, glioblastoma multiforme; MRI, magnetic resonance imaging.
