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Updated: May 4, 2026
10:34
Double Direct Injection of Blood into the Cisterna Magna as a Model of Subarachnoid Hemorrhage
Published on: August 30, 2020
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Subarachnoid hemorrhage: beyond aneurysms
Carrie P Marder1, Vinod Narla, James R Fink
11 All authors: Department of Radiology, University of Washington, Box 357115, 1959 NE Pacific St, NW011, Seattle, WA 98195-7115.
AJR. American Journal of Roentgenology
|December 28, 2013
Summary
Spontaneous subarachnoid hemorrhage (SAH) has diverse causes beyond ruptured aneurysms. CT scan patterns help differentiate SAH types and guide further investigation for accurate diagnosis.
Area of Science:
- Neurology
- Radiology
- Emergency Medicine
Background:
- Spontaneous subarachnoid hemorrhage (SAH) is commonly caused by ruptured saccular aneurysms.
- The differential diagnosis for SAH extends beyond aneurysms, especially based on clinical presentation and imaging findings.
Purpose of the Study:
- To classify SAH patterns based on CT findings.
- To guide differential diagnosis and subsequent imaging strategies for SAH.
- To review conditions that mimic SAH on imaging (pseudo-SAH).
Main Methods:
- Classification of SAH into three patterns based on unenhanced CT blood distribution: diffuse, perimesencephalic, and convexal.
- Analysis of hemorrhage epicenter to refine differential diagnosis.
- Review of clinical conditions causing pseudo-SAH.
Main Results:
- SAH can be categorized into diffuse, perimesencephalic, and convexal patterns on CT.
- Hemorrhage location is crucial for differential diagnosis and imaging guidance.
- Pseudo-SAH, mimicking SAH on CT/MRI, is a recognized imaging artifact.
Conclusions:
- CT-based classification of SAH patterns aids in diagnosis.
- Understanding hemorrhage distribution and epicenter is key for effective workup.
- Recognition of pseudo-SAH is important to avoid misdiagnosis.
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