9 year male with headaches and vomiting and previously documented mega cisterna magna. Compared to previous. There is no evidence of intracranial hemorrhage, mass, or acute infarct. The ventricles and basal cisterns are normal in size and configuration. The small CSF signal intensity structure along the dorsal midline posterior fossa with no restricted diffusion or enhancement is unchanged since the prior exam. There is again mild scalloping of the adjacent calvarial table. There is no midline shift or herniation. The major cerebral flow voids are intact. There is no abnormal intracranial enhancement. The orbits, skull, paranasal sinuses, and scalp soft tissues are grossly unremarkable.
No acute intracranial abnormality. Stable mega cisterna magna.