 The intracranial internal carotid arteries are normal in course and caliber. Along the proximal petrous right internal carotid artery, there is slight attenuation of flow-related enhancement, which is favored to relate to asymmetric bone along the petrous canal and focal tortuosity of the vessel at this level. The middle and anterior cerebral arteries are unremarkable. The PComm arteries are not visualized bilaterally. The vertebral arteries and basilar artery are normal in course and caliber. There is stable minimal irregularity involving the right P2 and P3 segments and left P2 segment. There is no evidence of flow-limiting stenosis or aneurysm.Encephalomalacia and ex vacuo dilatation of the occipital horn of the left lateral ventricle in the left parieto-occipital region is better assessed on the recent prior brain MRI.
Stable minimal irregularity of the distal PCAs bilaterally without evidence of flow limiting stenosis.