Subarachnoid hemorrhage other imaging findings

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Subarachnoid Hemorrhage Microchapters

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Sara Mehrsefat, M.D. [2]

Overview

Other imaging findings

Once a subarachnoid hemorrhage is confirmed, the next question is about its origin. CT angiography (using radiocontrast) to identify aneurysms is generally the first step, as invasive angiography (injecting radiocontrast through a catheter advanced to the brain arteries) has a small rate of complications but is useful if there are plans to obliterate the source of bleeding, such as an aneurysm, at the same time.

Digital-subtraction cerebral angiography

Digital-subtraction cerebral angiography is used in following conditions:

  • In patients with uncertain diagnosis after CT scan and LP
  • In patients with septic endocarditis and SAH to search for mycotic aneurysms
  • To provide surgical information such as:
    • Cerebrovascular anatomy
    • Aneurysm location and source of bleeding
    • Aneurysm size and shape
    • Relation of the aneurysm to the parent artery and perforating arteries
    • Presence of multiple or mirror aneurysms

CT and MR angiography

References

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