By vgreene, 20 January, 2015 If CTA or MRA results uncertain/high clinical suspicion, proceed to conventional angiography<sup>32,33</sup>
By vgreene, 20 January, 2015 MRA w/o contrast [3] preferred; CTA<sup>31</sup> w/ contrast may be used for problem solving [4,1]
By vgreene, 20 January, 2015 If MRI unavailable/delayed, obtain CT<sup>29</sup> head w/o contrast [7]