2-year-old male with new right facial palsy and new cyst identified on prior head CT, status post multiple resection. There has been interval increase in size of a cystic component within the anterolateral aspect of the patient's right posterior fossa tumor. This exerts new mass effect displacing the pons, medulla, and upper cervical spine leftward with flattening. Redemonstrated is the patient's so residual tumor, which has a more chronic appearance on the current exam. As before there is a left frontal approach ventriculostomy catheter and the ventricles remain decompressed. Fluid is present within bilateral mastoid air cells.
There has been interval increase in size of a cystic component within the anterolateral aspect of the patient's right posterior fossa tumor. This exerts new mass effect displacing the pons, medulla, and upper cervical spine leftward with flattening.