Primary acute convexity subarachnoid hemorrhage in older patients: analysis of baseline, clinical and MRI characteristics including quantitative surface study and topographical probabilistic mapping of convexity subarachnoid hemorrhage.

Primary acute convexity subarachnoid hemorrhage (cSAH) in older patients can be observed in cerebral amyloid angiopathy (CAA) or idiopathic (with cSAH as potential initial manifestation of suspected CAA). We aimed to analyze baseline, clinical and MRI (including quantitative cSAH surface analysis and topographical probabilistic cSAH mapping) characteristics in elderly cSAH patients with CAA.