Exposure Gained through Different Approaches to the Posterior Cerebral Artery Segments. A, Pterional/transsylvian (red), pretemporal approach (blue), subtemporal or temporal transventricular (green), and posterior interhemispheric approach (orange). B, Supracerebellar transtentorial approach. C, Magnetic resonance angiography of the posterior cerebral artery. D, Vertebral digital angiogram (Townes projection), segments of the posterior cerebral artery. (Images courtesy of E de Oliveira)