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Background The angiographic evaluation of previously coiled aneurysms can be difficult yet remains critical for determining re-treatment. Objective The main objective of this study was to determine the inter-rater reliability for both the raymond scale and per cent embolization among a group of neurointerventionalists evaluating previously embolized aneurysms. Methods A panel of 15 neurointerventionalists examined 92 distinct cases of immediate post-coil embolization and 1 year post-embolization angiographs. Each case was presented four times throughout the study, along with alterations in demographics in order to evaluate intra-rater reliability. All respondents were asked to provide the per cent embolization (0-100%) and raymond scale grade (1-3) for each aneurysm. Inter-rater reliability was evaluated by computing weighted kappa values (for the raymond scale) and intraclass correlation coefficients (ICC) for per cent embolization. results 10 neurosurgeons and 5 interventional neuroradiologists evaluated 368 simulated cases. The agreement among all readers employing the raymond scale was fair (Κ=0.35) while concordance in per cent embolization was good (ICC=0.64). Clinicians with fewer than 10 years of experience demonstrated a significantly greater level of agreement than the group with greater than 10 years (Κ=0.39 and ICC=0.70 vs Κ=0.28 and ICC=0.58). When the same aneurysm was presented multiple times, clinicians demonstrated excellent consistency when assessing per cent embolization (ICC=0.82), but moderate agreement when employing the raymond classification (Κ=0.58). Conclusions Identifying the per cent embolization in previously coiled aneurysms resulted in good inter- and intra-rater agreement, regardless of years of experience. The strong agreement among providers employing per cent embolization may make it a valuable tool for embolization assessment in this patient population. [ABSTRACT FROM AUTHOR]