Neurologic complications of cerebral angiography: prospective analysis of 2,899 procedures and review of the literature.

By R. Willinsky, S. Taylor, K. terBrugge, R. Farb, George Tomlinson, W. Montanera. Radiology, 2003

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Guidelines for management of ischaemic stroke and transient ischaemic attack 2008. (2008, background): “These approaches are relatively risk-free, whereas intra-arterial angiography has a 1-3% risk of causing stroke in patients with symptomatic carotid lesions [167, 168].”
International guidelines for the diagnosis and management of hereditary haemorrhagic telangiectasia (2009, background): “Catheter angiography remains the ‘gold standard’ for diagnosis of most types of CVMs, but carries a 0.5% risk of permanent stroke.”
Complications of diagnostic cerebral angiography: evaluation of 19,826 consecutive patients. (2007, background): “Our findings of an increased rate of neurologic complications in patients known to have or suspected of having atherosclerotic cerebrovascular disease and in patients with a history of frequent TIAs is consistent with the findings of other authors (1,3,4,6).”