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The diffusion-perfusion mismatch
| MRI marker of the ischemic penumbra |
| The strongest predictor of lesion growth from baseline |
| Present in approximately 80% of MCA territory strokes up to 6 h |
| poststroke |
| Distinction of benign hypoperfusion from true tissue at risk not yet |
| possible prospectively |
MRI, magnetic resonance imaging; MCA, middle cerebral artery.
