Intra- and inter-rater agreement of the Menon, ASITN/SIR, and Calgary collateral grading systems using multiphase computed tomography angiography, and their association with clinical outcomes in acute stroke

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20 Oct 2026 0 comments

CONCLUSION: The Menon and ASITN/SIR systems demonstrated substantial to almost perfect intra-observer and moderate to almost perfect inter-observer agreement, while Calgary demonstrated excellent intra-observer and good inter-observer agreement. All three systems demonstrated comparable prognostic performance in AIS with LVO. Higher collateral scores predicted favorable outcomes and decreased mortality.