
Brain biopsy is the removal of a small piece of brain tissue for the diagnosis of abnormalities of the brain. It is used to diagnose Alzheimer`s disease, tumors, infection, inflammation, and other brain disorders. By examining the tissue sample under a microscope, the biopsy sample provides doctors with the information necessary to guide diagnosi....
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http://en.wikipedia.org/wiki/Brain_biopsy

Brain biopsy: Biopsy of the brain. Removal of a small piece of tissue from the brain for diagnostic purposes. One way the procedure may be done is by stereotactic needle biopsy in which the spot to be biopsied is located three-dimensionally, the information is entered into a computer, and the computer calculates the information and positions a need...
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http://www.medterms.com/script/main/art.asp?articlekey=30985
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