Subarachnoid hemorrhage MRI

Subarachnoid Hemorrhage Microchapters
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-In-Chief: Cafer Zorkun, M.D., Ph.D. [2]

MRI

• Fluid-attenuated inversion recovery (FLAIR) is the most sensitive MRI pulse sequence for the detection of SAH. SAH appears as high-intensity signal in normally low signal CSF spaces.
• T2- and T2*-weighted images can potentially demonstrate SAH as low signal intensity in normally high-signal subarachnoid spaces
• On T1-weighted images, acute SAH may appear as intermediate- or high-intensity signal in the subarachnoid space
• MR angiography may be useful in the evaluation of aneurysms and other vascular lesions that cause SAH

Indications for magnetic resonance angiography in aSAH are still few because of limitations such as

• Difficulty in scanning acutely ill patients
• predisposition to motion artifact
• Patient compliance
• Longer study time
• Cost