help me in this subject

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Try the journal Neurosurgical Focus. It is not the best neurosurgery journal, but access is free.

http://www.aans.org/education/journal/neurosurgical/

A search for "brainstem gliomas" brings up many results. Assuming your school has access to more journals, just go to pubmed and do a search. The Journal of Neurosurgery and Neurosurgery are two journals worth browsing.
 
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