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Updated: Dec 31, 2025
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Pre-Chiasmatic, Single Injection of Autologous Blood to Induce Experimental Subarachnoid Hemorrhage in a Rat Model
Published on: June 18, 2021
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Convexity Subarachnoid Hemorrhage Accompanied by Hyperacute Ischemic Stroke
Takeo Sato1, Kenichiro Sakai2, Masahiro Mimori2
1Department of Neurology, The Jikei University School of Medicine, Tokyo, Japan, takeo.sato.821@gmail.com.
Cerebrovascular Diseases (Basel, Switzerland)
|January 8, 2020
Summary
Convexity subarachnoid hemorrhage (cSAH) occurred in 0.5% of hyperacute ischemic stroke patients. Those with cSAH were more likely to have ipsilateral arterial stenosis or occlusion and right-hemisphere lesions, with favorable outcomes.
Area of Science:
- Neurology
- Neuroimaging
- Stroke Medicine
Background:
- Convexity subarachnoid hemorrhage (cSAH) is a rare finding.
- Clinical characteristics of cSAH accompanying hyperacute ischemic stroke are not well understood.
Purpose of the Study:
- To investigate the incidence and clinical characteristics of cSAH in patients with hyperacute ischemic stroke.
- To identify associations between cSAH and specific stroke features or outcomes.
Main Methods:
- Retrospective review of 1,249 consecutive symptomatic ischemic stroke patients.
- Initial MRI within 4.5 hours of onset.
- Identification and analysis of cSAH based on MRI findings.
Main Results:
- cSAH was identified in 0.5% of hyperacute arterial ischemic stroke patients within 4.5 hours of onset.
- Patients with cSAH showed higher rates of ipsilateral arterial stenosis or occlusion (100% vs. 47%) and right-hemisphere ischemic lesions (100% vs. 33%).
- All identified cases had favorable outcomes (modified Rankin Scale 0-1 at 3 months).
Conclusions:
- cSAH is an infrequent finding in hyperacute ischemic stroke.
- cSAH in this context is associated with ipsilateral arterial stenosis/occlusion and right-hemisphere lesions.
- Favorable outcomes were observed in all patients with cSAH and ischemic stroke.
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