Pilocytic astrocytoma, posterior fossa, VP shunt, resected in 1980. There are post-treatment findings in the posterior fossa. In particular, there is an unchanged enhancing lesion along the superior aspect of the cerebellar vermis with peripheral susceptibility effect, measuring up to approximately 25 mm. There are also nonspecific scattered punctate foci of susceptibility effect in the bilateral cerebral hemispheres. There is no evidence of acute infarct. The brain parenchyma and pituitary gland appear unremarkable. There is unchanged scattered nonspecific cerebral white matter T2 hyperintensity. There is a right posterior lateral ventricular catheter. The ventricles are unchanged in size and configuration. There is no midline shift or herniation. The major cerebral flow voids are intact. There is diffuse thickening of the calvarium. The orbits are grossly unremarkable.
1. Stable post-treatment findings in the posterior fossa with an unchanged lesion along the superior aspect of the cerebellar vermis.2. Unchanged shunted ventricular system.