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Intraoperation ICGVA images before and after clipping (upper: microscopic visualization; lower: infrared view of blood flow using ICGVA), A, MCA IA prior to clipping. B, MCA IA postclipping. ICGVA indicates microscope-integrated near-infrared indocyanine green video angiography; MCA, middle cerebral artery; IA, intracranial aneurysm.
