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Table 1: Characteristics of false-positive (n = 2) and false-negative (n = 10) evaluations
Location Size (mm) Reader Confidence Main Reason for Results
False-negative 
    Supraclinoid ICA 1.5 1 and 2 2, 1 Very small, close proximity to bone
    Supraclinoid ICA 1.8 1 and 2 3, 2 Very small, close proximity to bone
    Supraclinoid ICA 1.8 2 2 Very small
    PcomA 1.5 1 and 2 2, 2 Very small, prominent infundibulum
    PcomA 2.1 1 and 2 3, 3 Very small, prominent infundibulum
    PcomA 2.8 1 3 Prominent infundibulum
    MCA bifurcation 2.5 1 2 Obscured by overlapping vessels
    MCA bifurcation 2.8 2 3 Obscured by overlapping vessels
    A1 2.8 1 1 Unusual location
    Basilar tip 3.9 2 1 Atypical configuration, kissing aneurysm
False-positive 
    PcomA 1.9 2 4 Prominent infundibulum
    PcomA 1.5 1 4 Prominent infundibulum
Note:–ICA indicates internal carotid artery; PcomA, posterior communicating artery; MCA, middle cerebral artery; A1, first segment of anterior cerebral artery. Confidence score refers to a 5-point scale of reader certainty in identifying the presence or absence of the aneurysms (1 = definitely not present; 2 = probably not present; 3 = equivocal; 4 = probably present; 5 = definitely present).