Leptomeningeal Collateral Status by Signal Variance in Perfusion Magnetic Resonance Imaging: Association With Initial Stroke Severity and Early Functional Outcome After Thrombectomy.

After further division of the entire cohort by age, this difference did not reach statistical significance for patients younger than 80 years (age range, 28–79 years) ( P =0.246, Figure 2C ), but was again highly significant in the group of patients aged 80 years and older (age range, 80–99 years) ( P <0.001, Figure 2D ).

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