Background and Purpose—We systematically reviewed the literature on epidemiology, risk
factors, presumed cause, clinical course, and outcome of perimesencephalic hemorrhage …

Perimesencephalic nonaneurysmal subarachnoid hemorrhage (PNSAH) is a distinctive
disease, representing SAH centered in perimesencephalic cisterns, with negative …

Interventions: Low-molecular-weight heparin, followed by oral warfarin, was initiated
immediately as the treatment for cerebral venous sinus thrombosis and PNSAH. Outcomes …

BACKGROUND AND PURPOSE: Mechanisms underlying bleeding in nonaneurysmal
perimesencephalic SAH remain unclear. Previous investigators have suggested a …

This study aims to investigate the characteristics of patients with mild aneurysmal and non-
aneurysmal perimesencephalic and non-perimesencephalic subarachnoid hemorrhage …

Background. The ideal management of SAH patients with negative initial DSA findings
remains unresolved. Objective.(i) To present risk factors, clinical courses, and outcomes in …

Background Non-aneurysmal subarachnoid hemorrhages (SAHs) are thought to have a
benign clinical course compared to aneurysmal SAHs. The aim of this study is to report the …

Objectives The basal vein of Rosenthal (BVR) variant is a potential origin of bleeding in
angiogram-negative subarachnoid hemorrhage (AN-SAH). We compared the rate and …

Purpose The cause of spontaneous subarachnoid hemorrhage (SAH) is unknown in 10% of
cases. The aim of this study was to demonstrate the characteristics of patients with …

Background and purpose Perimesencephalic subarachnoid hemorrhage (PSAH) is not
consistently defined in the existing literature. The purpose of this study was to test the inter …