Evaluate The Value Of CTA And MRA In The Diagnosis Of Spontaneous Subarachnoid Hemorrhage

[Objectives] To evaluate the value of CTA and MRA in the diagnosis of spontaneous subarachnoid hemorrhage. (SAH)[Methods] 80 patients with SAH confirmed by CT or lumbar puncture were divided into the CTA group (40 cases) and MRA group (40 cases). All patients underwent DSA, either CTA or MRA images were compared blindly with the DSA findings. Suitable statistical methods were applied to the data.[Results] CTA had a sensitivity of 94.1% and specificity of 100%. MRA had a sensitivity of 85.3% and specificity of 100%. No significant difference of sensitivity and specificity was found between CTA and MRA. Both CTA and MRA provided valuable preoperative information.[Conclusion] Both CTA and MRA had high sensitivity and specificity in the etiological diagnosis of SAH. Each method had advantages and disadvantages respectively. In addition CTA, being a fast non-invasive method, can be used as a reliable alternative to DSA in most of the patients especially in emergency situation demanding immediate operation. MRA is a feasible tool for detecting aneurysms in relatives of patients with SAH.