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These authors found that increased cerebral blood flow and volume were seen in the basal ganglia of 4.3% of patients with ischemic strokes with CT perfusion. All patients had underlying MCA occlusions, 30% underwent hemorrhagic transformations, and the hyperperfused areas eventually became infarcted in all. Thus, acute basal ganglia hyperperfusion in patients with stroke may indicate nonviable parenchyma.

Imaging findings in 45 patients with eclampticposterior reversible encephalopathy syndrome were assessed. The most common affected areas were the occipital, parietal, frontal, and temporal lobes. Serum creatinine, uric acid, and lactate dehydrogenase values and presence of moderate or severe PRES were significantly associated with mortality. Eclamptic PRES demonstrated a higher incidence of atypical distributions and cytotoxic edema than previously thought.