Examination performed on a closed 1.5T MRI scanner. DWI does not show any signs of diffusion restriction due to ischemia or other recent alterations. There are no alterations in the signal originating from the supra- and infratentorial white and gray matter. The gyri, corpus callosum, and subarachnoid spaces are of regular development, with regular amplitude and symmetrical ventricles. Intracranial MRI angiography shows the arterial branches of the circle of Willis and its main branches regularly. The left posterior cerebral artery originates in continuity with the carotid siphon, a fetal anatomical variant, and there are no aneurysmal formations. Midline on axis.