These tumors are usually slow-growing and well circumscribed. These tumors are comparable to the highly anaplastic gliomas in prognosis. Survival statistics are inexact for this group because the cell types and grade of the most malignant-appearing cells influence prognosis. In general, these tumors carry a prognosis that is between the prognoses of well-differentiated and anaplastic astrocytomas. It has the tendency to spread from the brain to the spinal axis.
Prognosis is dependent on the staging following surgical resection.
They can vary from the slow-growing pineocytoma to the more malignant and faster growing pineoblastoma. These uncommon tumors vary in prognosis. The absence of biopsy specimens in many series make the prognosis for each tumor type difficult to evaluate. There are other variants that constitute a group called malignant meningioma and include malignant meningioma, hemangiopericytoma, papillary meningioma, and meningeal sarcoma. Malignant meningiomas are more likely than other meningiomas to metastasize within the craniospinal axis.