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FIG 5. Delayed ICA filling and intracranial dilution from collaterals.
A, Lateral carotid angiogram (neck view) shows delayed ICA filling (larger arrow) beyond the nearly occluded bulb stenosis.
B, There is dilution of contrast of middle cerebral branches (small arrows) intracranially, implying inflow of unopacified blood from circle of Willis collateral sources.
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