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DICOM HelpSource: Local (us-east1-c)
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Demographics:
48 years old, Male
Indication:
Unresponsive
Findings
- Diffuse sulcal effacement and symmetric hypoattenuation and loss of gray-white differentiation throughout the supratentorial and infratentorial brain with basal cisternal hyperattenuation favored to reflect pseudosubarachnoid hemorrhage. Symmetric effacement of the ventricular system.
Diagnosis
Pseudo-Subarachnoid Hemorrhage
Discussion
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In the setting of diffuse cerebral edema, the basal cisterns, falx and tentorium can appear hyperdense.
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Typically the attenuation value is less than that of true subarachnoid hemorrhage (in the reference listed below, pseudo-SAH ranged from 29 to 33 HU versus 60 to 70 in true SAH).
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Potentially secondary to a combination of cerebral edema in the surrounding parenchyma, displacement of CSF in the extra-axial space, and engorgement of superficial vessels.
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