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Poor radiologic outcome at follow-up (infarct volume ≥70 mL) in relation to CSs (N = 61)
Poor Outcome/Characteristic Present (n/N) (%)Poor Outcome/Characteristic Absent (n/N) (%)Risk Ratio (95% CI)
Single-phase CTA
    Poor extent of collateral fillinga25/42 (60%)8/19 (42%)1.4 (0.8–2.5)
Dynamic CTA, extent of filling
    CS 0–1–––
    CS 25/5 (100%)7/19 (37%)b2.7 (1.5–4.9)
    CS 39/12 (75%)7/19 (37%)b2.0 (1.0–4.0)
    CS 48/13 (62%)7/19 (37%)b1.7 (0.8–3.5)
    CS 54/12 (33%)7/19 (37%)b0.9 (0.4–2.4)
Dynamic CTA
    Poor extent of collateral fillinga14/17 (82%)19/44 (43%)1.9 (1.3–2.9)
Dynamic CTA, extent and timing of filling
    Poor collaterals and slow filling4/5 (80%)9/22 (41%)c2.0 (1.0–3.8)
    Poor collaterals and fast filling23/30 (77%)9/22 (41%)c1.9 (1.1–3.2)
    Good collaterals and slow filling14/26 (54%)9/22 (41%)1.3 (0.7–2.4)
  • ↵a Poor extent of collateral filling was defined as collateral filling in ≤50% of the occluded MCA territory in the affected hemisphere.
  • ↵b CS 6 (maximum collateral score) was taken as a reference.
  • ↵c Group with good and fast collateral filling was taken as a reference.