18 year-old female with history of astrocytoma of the posterior fossa, off therapy evaluation. Redemonstrated are postoperative findings within the posterior fossa. Surgical deformation of the fourth ventricle is unchanged as is the degree and extent of T2 hyperintensity along the roof of the fourth ventricle, extending into the vermis, is also unchanged. This tissue also redemonstrates mild intrinsic T1 hyperintensity. As before, there is no abnormal enhancement.Elsewhere, parenchymal signal intensity and morphology are within normal limits. No edema or mass effect is seen. No pathologic enhancement is detected. No evidence of intracranial hemorrhage or any new fluid collections are seen. Ventricles are stable in size and morphology. A small left sphenoid sinus mucous retention cyst is unchanged. The remaining paranasal sinuses and mastoid air cells are clear. Expected vascular flow voids are demonstrated.
Redemonstration of postoperative findings in the cerebellum with no evidence to suggest progressive or recurrent disease.