1. ABTA's: A Primer of Brain Tumors
The name PNET encompasses medulloblastomas, the malignant forms of pineal cell tumors, malignant ependymomas, and other tumors. It may be malignant because it consists of cancer cells, or it may be called malignant because of its location.
http://neurosurgery.mgh.harvard.edu/abta/primer.htm

2. Childhood Cerebral Astrocytoma/Malignant Glioma Treatment - National Cancer Institute
Key Points for This Section Cerebral astrocytoma is a type of malignant glioma. Cerebral astrocytoma is a type of malignant glioma. The symptoms of childhood cerebral astrocytoma vary and often depend on the child s age, where the tumor is...
http://www.cancer.gov/templates/doc.aspx?viewid=e8fba67f-e7b7-45b5-bc13-814cb10...

3. eMedicine - Glioblastoma Multiforme : Article by Jeffrey N Bruce, MD
Gliomas comprise a heterogeneous group of neoplasms that differ in location within the CNS, in age and sex distribution, in growth potential, in extent of invasiveness, in morphological features, in tendency for progression, and in response to...
http://www.emedicine.com/med/topic2692.htm