History of relapsed astrocytoma treated with craniotomy and chemotherapy: surveillance exam. There are post-treatment findings in the posterior fossa, including suboccipital craniotomy with scattered foci of susceptibility effect in the surgical bed. There is no significant interval change in size of the partially enhancing infiltrative mass involving the tectum, midbrain, right cerebellar peduncle, cerebellar vermis, and superior cerebellar hemispheres. The mass measures up to approximately 30 mm, previously also 30 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 unchanged. There is a right mesiodens.
No significant interval change in size of the treated infiltrative hindbrain mass or the shunted ventricular system.