 BRAIN: There is mild enhancement of the cisternal segment of the right trigeminal nerve (series 401 image 65 and series 4 image 86); the left trigeminal nerve is unremarkable in appearance. There is no evidence of intracranial hemorrhage, mass, or acute infarct. There is a linear focus of T2 hyperintensity oriented in the cranio-caudal direction within the posterolateral right pons and medulla. There is heterogeneous signal with possible mild enhancement and expansion of the central sphenoid bone most compatible with fibrous dysplasia. The ventricles and basal cisterns are normal in size and configuration. There is no midline shift or herniation. The major cerebral flow voids are intact. The paranasal sinuses and scalp soft tissues are unremarkable.MRA HEAD: The intracranial internal carotid arteries are normal in course and caliber. The middle and anterior cerebral arteries are unremarkable. The vertebral arteries, basilar artery, and posterior cerebral arteries are normal in course and caliber with a fetal origin of the right posterior cerebral artery. There is no evidence of flow-limiting stenosis or aneurysm.
1.No evidence of acute infarct or mass. 2.Mild enhancement of the cisternal portion of the right trigeminal nerve of uncertain significance. 3.Probably fibrous dysplasia of the sphenoid bone that could be confirmed with CT if clinically indicated. 4.Non-specific T2 linear hyperintensity within the right hemi-pons and medulla, likely corresponding to fiber tracts and of uncertain significance. 