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FIG 1. Representative early CT sign of grade I occlusion.
A, Nonenhanced CT scan in a 71-year-old man obtained 1.5 hours after left MCA stroke. Note loss of the left insular ribbon (arrows) versus normal right insular ribbon (arrowheads). The left lentiform nucleus appears normal.
B, Left carotid angiogram, obtained immediately after initial CT scanning, shows an embolic occlusion of the left M2 segment (arrow). Lateral lenticulostriate arteries (arrowheads) were well opacified from their origins.
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