History of relapsed astrocytoma status post craniotomy and radiation therapy: off therapy evaluation. There are post-treatment findings, including suboccipital craniotomy. There appears to be interval decrease in size of the partially enhancing infiltrative mass involving the tectum, midbrain, right cerebellar peduncle, cerebellar vermis and superior cerebellar hemispheres. The mass now measures up to approximately 30 mm, previously 35 mm. There are multiple unchanged foci of susceptibility effect in the treatment bed, bilateral occipital lobes, and medial temporal lobe. There is a right transfrontal ventricular shunt catheter that terminates in the left lateral ventricle. The ventricles are unchanged in size and configuration. There is no midline shift or herniation. The major cerebral flow voids are intact. The orbits, skull, paranasal sinuses, and scalp soft tissues are grossly unremarkable. There is a probable right mesiodens.
Apparent interval decrease in size of the infiltrative hindbrain mass.