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Table 3: 
Aneurysm detection: characteristics of false-negative and false-positive evaluations
Aneurysm LocationSize, mmReaderMain Reason for Results
False-negative
    Basilar tip1.51, 3Very small, multiple aneurysms
    AchoA1All readersVery small
    PcomA32Considered as an infundibulum
    Carotid-ophthalmic ICA23Very small, multiple aneurysms
    Paraclinoid ICA31, 2Small, close to bony structures
    MCA: M2 segment2All readersVery small, unusual location
    MCA bifurcation21Very small, multiple aneurysms
    MCA bifurcation24Very small, obscured by overlapping vessels
False-positive
    ACA: A2 segment23Vasculitis
    PcomA24Prominent infundibulum
    PcomA34Prominent infundibulum
  • Note:—AchoA indicates anterior choroidal artery; PcomA, posterior communicating artery; ICA, internal carotid artery; MCA, middle cerebral artery; ACA, anterior cerebral artery.