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Updated: May 26, 2026
09:14
Pre-Chiasmatic, Single Injection of Autologous Blood to Induce Experimental Subarachnoid Hemorrhage in a Rat Model
Published on: June 18, 2021
Headache. Diagnosing subarachnoid hemorrhage: are CT scans enough?
Peter J Hutchinson1, Peter J Kirkpatrick
1Division of Neurosurgery, Department of Clinical Neurosciences, University of Cambridge, Addenbrooke's Hospital, Hills Road, Cambridge, UK. pjah2@cam.ac.uk
Nature Reviews. Neurology
|January 11, 2012
Summary
Subarachnoid hemorrhage, a dangerous headache cause, can be detected by CT scans with high accuracy. However, CT imaging alone may not eliminate the need for further diagnostic tests like lumbar puncture in all cases.
Area of Science:
- Neurology
- Radiology
- Emergency Medicine
Background:
- Subarachnoid hemorrhage presents as a severe headache and is a critical condition.
- Early diagnosis is crucial for patient outcomes.
- Cranial computed tomography (CT) is a primary imaging modality for headache evaluation.
Purpose of the Study:
- To evaluate the diagnostic performance of CT scans in identifying subarachnoid hemorrhage.
- To determine if CT imaging can obviate the need for lumbar puncture in patients with headache.
Main Methods:
- Review of recent studies on CT imaging for subarachnoid hemorrhage.
- Analysis of CT scan sensitivity and specificity in diagnosing the condition.
- Comparison of CT findings with lumbar puncture results.
Main Results:
- CT scans demonstrate high sensitivity in detecting subarachnoid hemorrhage.
- False-negative results can occur, particularly in subtle cases.
- Lumbar puncture remains essential for definitive diagnosis when CT is equivocal or negative but suspicion is high.
Conclusions:
- While CT is a valuable tool for diagnosing subarachnoid hemorrhage, it does not entirely replace lumbar puncture.
- Clinical judgment and patient presentation are key in deciding the necessity of lumbar puncture post-CT scan.
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