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Representative examples of disagreed ratings of four non-contrast computed tomographic (NCCT) markers and Spot Sign (SS) on CT-angiography (CTA) for intracerebral hemorrhage expansion. (A) SS on CTA (white arrow) mistaken for intraventricular plexus calcification (black arrow) (B). (C) Blend sign (white arrows) mistaken for Fluid Sign1. (D) Swirl Sign mistaken for Hypodensities (black arrow). (E) Hypodensities (black arrow) mistaken for Swirl Sign (F) [6].
