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Types and frequencies of missed pathology from the primary interpretation of CTA studies
Misses
Aneurysms (n = 13, 50%)
    Anterior communicating artery (1 mm, 2 mm, 2 mm, 3 mm, 3 mm, 3 mm)6
    Posterior communicating artery (3 mm)1
    Paraophthalmic artery (1 mm, 3 mm)2
    Cavernous carotid (4 mm, 4 mm)2
    Middle cerebral artery (2 mm, 2 mm)2
Arterial occlusion or severe stenosis (n = 5, 19%)
    Anterior cerebral artery (A2) occlusion1
    Middle cerebral artery (M2) occlusion1
    Intracranial vertebral artery stenosis (75%)1
    Intracranial vertebral artery occlusion2
Sino-venous thrombosis (n = 1, 4%)
    Sigmoid sinus/internal jugular vein thrombosis1
Dissections (n = 1, 4%)
    Left common carotid artery traumatic dissection with pseudoaneurysm (3 mm)1
Vascular anomaly (n = 2, 8%)
    Spot sign (2 mm)1
    Venous varix prepontine cistern (16 mm)1
Other (n = 4, 15%)
    Malpositioned nasogastric tube1
    Nasopharyngeal mass1
    Parapharyngeal mass1
    Sellar mass1
        Total26