Best test to determine etiology of SAH: (A) Enhanced CT, (B) Unenhanced CT, (C) Intra aerial digital Substraction Angiography, (D) MRI
Answer is C. C i.e. Intra aerial digital Substraction Once dx is done by CT Scan; digital substraction angiography (DSA) is done to determine etiology. DSA is most sensitive & best inv. for determining etiologyQ. Now DSA is being replaced by noninvasive methods as MRA (MRI - angiography) & CTA (CT - Angiography).