Convexity subarachnoid haemorrhage (cSAH)
Written and reviewed by Dr Ibrahim Imam, Consultant Neurologist. Last reviewed .
Convexity subarachnoid haemorrhage (cSAH). This is a non-aneurysmal SAH. It accounts for about 6% of cases of SAH. Fully referenced neurology checklist.
Pathology
- This is a non-aneurysmal SAH
- It accounts for about 6% of cases of SAH
- It is isolated to the cortical surfaces
- The blood volume is less than in aneurysmal SHA
- It does not extend into the Sylvian or hemispheric fissure
- It does not involve the basal cisterns, the parenchyma or ventricles
- By contrast, aneurysmal SAH tends to occur around the Circle of Willis
Most frequent causes
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Other vascular causes
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Other causes
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Clinical features
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Radiological investigations
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Cerebrospinal fluid (CSF) analysis
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Potential investigations
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Clinical differentials
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Radiological differentials
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Synonyms
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References
- Ly JV, Ma H, Shaloo S, Clissold B, Phan T. Convexity subarachnoid haemorrhage: a practical guide. Pract Neurol 2023 (Online ahead of print).
- Okar S, Arat A, Arsava EM, Peker A, Berker M, Topcuoglu MA. Can convexity subarachnoid hemorrhage be caused by rupture of a saccular aneurysm? J Vasc Interv Neurol 2018; 10:1-3.
- Geraldes R, Sousa PR, Fonseca AC, et al. Nontraumatic convexity subarachnoid hemorrhage: different etiologies and outcomes. J Stroke Cerebrovasc Dis 2014; 23:e23-e30.
- Chandra RV, Leslie-Mazwi TM, Oh D, Mehta B, Yoo AJ. Extracranial internal carotid artery stenosis as a cause of cortical subarachnoid hemorrhage. AJNR Am J Neuroradiol 2011; 32:E51-E52.
- Cuvinciuc V, Viguier A, Calviere L, Raposo N, Larrue V, Cognard C, Bonneville F. Isolated acute nontraumatic cortical subarachnoid hemorrhage. AJNR 2010; 31:1355-1362.
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