Reply:

References

1. 1.↵
   2. Heit JJ,
   3. Pastena GT,
   4. Nogueira RG, et al

   . Cerebral angiography for evaluation of patients with CT angiogram-negative subarachnoid hemorrhage: an 11-year experience. AJNR Am J Neuroradiol 2016;37:297–304 doi:10.3174/ajnr.A4503 pmid:26338924

   Abstract/FREE Full Text
2. 2.↵
   2. Westerlaan HE,
   3. van Dijk JM,
   4. van Dijk MJ, et al

   . Intracranial aneurysms in patients with subarachnoid hemorrhage: CT angiography as a primary examination tool for diagnosis—systematic review and meta-analysis. Radiology 2011;258:134–45 doi:10.1148/radiol.10092373 pmid:20935079

   CrossRefPubMedWeb of Science
3. 3.↵
   2. Kalra VB,
   3. Wu X,
   4. Forman HP, et al

   . Cost-effectiveness of angiographic imaging in isolated perimesencephalic subarachnoid hemorrhage. Stroke 2014;45:3576–82 doi:10.1161/STROKEAHA.114.006679 pmid:25336513

   Abstract/FREE Full Text
4. 4.↵
   2. Al-Shahi R,
   3. White PM,
   4. Davenport RJ, et al

   . Subarachnoid haemorrhage. BMJ 2006;333:235–40 doi:10.1136/bmj.333.7561.235 pmid:16873858

   FREE Full Text