Head CT (A-C) and CTA (D) of a 70-year-old man 21 hours after ictus demonstrating a perimesencephalic bleeding pattern with an aneurysm of the basilar artery.
Head CT (E-G) and CTA (H) of a 52-year-old woman 18 hours after ictus showing a nonperimesencephalic bleeding pattern (arrow points at extension to the lateral part of the Sylvian fissure and dashed arrow points to intraventricular hemorrhage) with an aneurysm of the basilar artery.
From: Mensing LA, Vergouwen MDI, Laban KG, et al. Perimesencephalic Hemorrhage: A Review of Epidemiology, Risk Factors, Presumed Cause, Clinical Course, and Outcome. Stroke 2018; 49:1363. DOI:
10.1161/STROKEAHA.117.019843. Copyright © 2018 American Heart Association. Reproduced with permission from Wolters Kluwer Health. Unauthorized reproduction of this material is prohibited.
