FIG 1. Schematic (A) and contrast-enhanced (B) CTA source images display region-of-interest segmentation. Single-section total lesion volume is the entire region of hypoattenuation on the section containing the core (TL, green). Single-section lesion core is the region of maximal hypoattenuation in the right insula (C, dark blue), compared with normal mirror-image tissue in contralateral left insula (NL, light blue).