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KEY FACTS
Terminology
Imaging
Top Differential Diagnoses
Pathology
Clinical Issues
TERMINOLOGY
Abbreviations
- Perimesencephalic nonaneurysmal subarachnoid hemorrhage (pnSAH)
Synonyms
- Perimesencephalic SAH
Definitions
- SAH centered anterior to midbrain ± pons
- No source demonstrated at angiography
IMAGING
General Features
CT Findings
MR Findings
Angiographic Findings
Imaging Recommendations
DIFFERENTIAL DIAGNOSIS
PATHOLOGY
General Features
Gross Pathologic & Surgical Features
CLINICAL ISSUES
Presentation
Demographics
Natural History & Prognosis
Treatment
DIAGNOSTIC CHECKLIST
Consider
Image Interpretation Pearls
Selected References
- Flores G et al: Descriptive study of aneurysmal and nonaneurysmal subarachnoid hemorrhage and the role of confirmative digital subtraction angiography in patients with nonaneurysmal subarachnoid in Puerto Rico. World Neurosurg. 134:e481-6, 2020
- Atchie B et al: Comparing outcomes of patients with idiopathic subarachnoid hemorrhage by stratifying perimesencephalic bleeding patterns. J Stroke Cerebrovasc Dis. 28(9):2407-13, 2019
- qDerraz I et al: Recurrent bleeding after perimesencephalic hemorrhage: case report and review of the literature. World Neurosurg. 129:287-91, 2019
- Fragata I et al: Ischemic lesions in acute and subacute perimesencephalic subarachnoid hemorrhage. AJR Am J Roentgenol. 212(2):418-24, 2019
- Fragata I et al: Comparison of cerebral perfusion in perimesencephalic subarachnoid hemorrhage and aneurysmal subarachnoid hemorrhage. Neuroradiology. 60(6):609-16, 2018
- Marder CP et al: Subarachnoid hemorrhage: beyond aneurysms. AJR Am J Roentgenol. 202(1):25-37, 2014
- Buyukkaya R et al: The relationship between perimesencephalic subarachnoid hemorrhage and deep venous system drainage pattern and calibrations. Clin Imaging. 38(3):226-30, 2014
- Kapadia A et al: Nonaneurysmal perimesencephalic subarachnoid hemorrhage: diagnosis, pathophysiology, clinical characteristics and long-term outcome. World Neurosurg. 82(6):1131-43, 2014
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References
Tables
Tables
KEY FACTS
Terminology
Imaging
Top Differential Diagnoses
Pathology
Clinical Issues
TERMINOLOGY
Abbreviations
- Perimesencephalic nonaneurysmal subarachnoid hemorrhage (pnSAH)
Synonyms
- Perimesencephalic SAH
Definitions
- SAH centered anterior to midbrain ± pons
- No source demonstrated at angiography
IMAGING
General Features
CT Findings
MR Findings
Angiographic Findings
Imaging Recommendations
DIFFERENTIAL DIAGNOSIS
PATHOLOGY
General Features
Gross Pathologic & Surgical Features
CLINICAL ISSUES
Presentation
Demographics
Natural History & Prognosis
Treatment
DIAGNOSTIC CHECKLIST
Consider
Image Interpretation Pearls
Selected References
- Flores G et al: Descriptive study of aneurysmal and nonaneurysmal subarachnoid hemorrhage and the role of confirmative digital subtraction angiography in patients with nonaneurysmal subarachnoid in Puerto Rico. World Neurosurg. 134:e481-6, 2020
- Atchie B et al: Comparing outcomes of patients with idiopathic subarachnoid hemorrhage by stratifying perimesencephalic bleeding patterns. J Stroke Cerebrovasc Dis. 28(9):2407-13, 2019
- qDerraz I et al: Recurrent bleeding after perimesencephalic hemorrhage: case report and review of the literature. World Neurosurg. 129:287-91, 2019
- Fragata I et al: Ischemic lesions in acute and subacute perimesencephalic subarachnoid hemorrhage. AJR Am J Roentgenol. 212(2):418-24, 2019
- Fragata I et al: Comparison of cerebral perfusion in perimesencephalic subarachnoid hemorrhage and aneurysmal subarachnoid hemorrhage. Neuroradiology. 60(6):609-16, 2018
- Marder CP et al: Subarachnoid hemorrhage: beyond aneurysms. AJR Am J Roentgenol. 202(1):25-37, 2014
- Buyukkaya R et al: The relationship between perimesencephalic subarachnoid hemorrhage and deep venous system drainage pattern and calibrations. Clin Imaging. 38(3):226-30, 2014
- Kapadia A et al: Nonaneurysmal perimesencephalic subarachnoid hemorrhage: diagnosis, pathophysiology, clinical characteristics and long-term outcome. World Neurosurg. 82(6):1131-43, 2014
