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Fig. 4B —Depiction of effect of lack of adequate collateral flow on
final infarct volume in 70-year-old man with 4 hours of left hemiparesis.
Thrombolytic therapy was not administered. Unenhanced axial CT image of brain
obtained 36 hours after A shows large infarction in essentially entire
right middle cerebral artery territory. Inadequate collateral circulation led
to development of large artery territory infarct.
