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]; Sara Mehrsefat, M.D. [3]

MRI

MRI may indicated in all patients with subarachnoid hemorrhage if no lesion were found on prior angiography.

• Brain and spinal cord vascular malformations

MRI may be helpful in diagnosis of occult vascular lesions that can cause subarachnoid hemorrhage and may include:

• Tumors
  • Pituitary adenoma
• Arterial dissection (arterial wall hematoma)

Disadvantage of performing MRI in patients with subarachnoid hemorrhage may include:

• Higher cost
• Lower availability
• Longer study time make it less optimal for detecting SAH. In addition
• Not being sensitive for detection of subarachnoid hemorrhage within the first 48 hours

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