Subarachnoid hemorrhage CT

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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]

CT

Subarachnoid hemorrhage appears as a high-attenuating, amorphous substance that fills the normally dark CSF-filled subarachnoid spaces.
These findings are most evident in the largest subarachnoid spaces, such as the suprasellar cistern and Sylvian fissures.
Acute Subarachnoid hemorrhage is typically 50-60 HU.
When CT scanning is performed several days to weeks after the initial bleed, the findings are more subtle.
- The initial high-attenuation of blood and clot tend to decrease, and these appear as intermediate gray.
- These findings can be isointense relative to normal brain parenchyma.
In addition to detecting Subarachnoid hemorrhage, CT is useful in localizing the source of bleeding.

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