Evaluation of an anatomic definition of non-aneurysmal perimesencephalic subarachnhoid hemorrhage

摘要: Background and purpose Perimesencephalic subarachnoid hemorrhage (PSAH) is not consistently defined in the existing literature. The of this study was to test inter-observer variability specificity for non-aneurysmal (SAH) an anatomic definition PSAH. Methods Medical records all patients who underwent catheter angiography evaluation non-traumatic SAH between July 2002 April 2012 were reviewed. Patients with anterior circulation aneurysms excluded. Three blinded reviewers assessed whether each admission CT scan met following criteria PSAH: (1) center bleeding located immediately contact brainstem prepontine, interpeduncular, or posterior suprasellar cistern; (2) blood limited suprasellar, crural, ambient, and/or quadrigeminal cisterns cisterna magna; (3) no extension into Sylvian interhemispheric fissures; (4) intraventricular incomplete filling fourth ventricle occipital horns lateral ventricles (ie, consistent reflux); (5) intraparenchymal blood. Results 56 50 communicating artery identified. Seventeen (16%) 106 scans No aneurysm identified subgroup. Inter-observer agreement excellent κ scores 0.89–0.96 disagreement 2.8% (3/106) cases. Conclusions Our PSAH correlated a low risk brain applied agreement.