Male, 4 years old, with behavior and speech changes over the last few months. History of cisterna magna with increased ventricular size. Prominence of the extracerebral CSF spaces seen on the prior examination has resolved, including in the posterior fossa, indicating that the prior findings likely represented benign prominence of the extra-axial spaces of infancy. The lateral and third ventricles do, however, remain mildly prominent, though this is improved relative to the prior examination.No evidence of restricted diffusion, edema, mass effect or focal parenchymal signal abnormality is seen. No migrational anomalies or structural defects are identified. There is a 4 mm left temporal choroid plexus or choroidal fissure cyst. No evidence of intracranial hemorrhage or any abnormal extra-axial fluid collection is seen. The pituitary region is unremarkable. The corpus callosum is fully formed and intact. The brainstem and cerebellum are unremarkable. The pattern of white matter myelination is appropriate.
Prominence of the extracerebral CSF spaces seen in the prior examination, including that thought to represent a magna cisterna magna, have essentially resolved. These findings therefore likely represented benign prominence of the extra-axial spaces of infancy.Slight prominence of the ventricular system does persist. This could reflect normal anatomic variation or mild white matter volume loss. No definite focal parenchymal lesions are seen.