 Suboccipital craniotomy changes are again seen. The previously demonstrated solid and cystic extra-axial mass measuring approximately 3.7 x 2.3 cm in greatest axial dimensions (series 7, image 25) is not significantly changed compared to prior examination. The mass encases the vertebral basilar arteries as well as extends into the Meckel's cave and right internal auditory canal. In addition, the tumor extends caudally along the dorsolateral aspect of the upper cervical spinal cord. The caudal spinal extent of the lesion is difficult to delineate. On postcontrast images, the tumor does not demonstrate significant enhancement, similar to prior examination. There is persistent significant mass effect upon the caudal brainstem and upper cord.There is a right posterior parietal approach ventriculostomy catheter stable position, with the tip of the catheter near the right foramen of Monro. The lateral and third ventricles are stable and decompressed. There is no evidence of acute infarct. There is no midline shift or herniation. The major cerebral flow voids are intact. Mucosal thickening of the sphenoid sinus has resolved.
Stable appearance of predominantly extra-axial right posterior fossa mass with persistent mass effect on the caudal brainstem and upper cervical spinal cord.