History of medulloblastoma status post treatment: weakness. There are postoperative findings related to posterior fossa tumor resection and prior transfrontal ventricular shunting. There is extensive encephalomalacia in the cerebellum and scattered punctate foci of susceptibility effect in the cerebellum and cerebral white matter, which are likely treatment-related. There is an unchanged nodular area along the distorted superior vermis with areas of intrinsically T1 hyperintensity. However, there is no evidence of enhancing tumor. There are unchanged patchy areas of T2 hyperintensity in the right frontal and occipital periventricular white matter. There is a small right superior frontal gyrus developmental venous anomaly. There are punctate foci of susceptibility effect in the left amygdala and left parietal lobe white matter. There is no evidence of acute infarct. The ventricles are diffusely prominent, but unchanged. There is no midline shift or herniation. The major cerebral flow voids are intact. There is fatty marrow in the skull base related to radiation therapy. There are bilateral lens implants. There are persistent secretions within the left maxillary sinus.
Post-treatment findings related to fourth ventricular medulloblastoma resection and irradiation without evidence of recurrent tumor.