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Fig. 3 —Bar graph shows number of missed aneurysms on CT angiography (CTA) (gray) compared with reference standard (digital subtraction angiography) listed over total number of CTA-detected aneurysms in that location (white). Most missed aneurysms were of middle cerebral artery (MCA), which was also most common aneurysm location. Highest percentage of missed aneurysms were of posterior cerebral artery (PCA), with 45% of aneurysms in that location missed. ICA = internal carotid artery, Acom = anterior communicating artery, Pcom = posterior communicating artery. ACA = anterior cerebral artery.