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amino acidconcentrated in neurons that functions   Conflicts of interest
            as a neuronal marker. Any destruction of neurons,   There are no conflicts of interest.
            such as noted by high grade malignant tumors or
            radiation-induced necrosis, decreases the amount of   REFERENCES
            NAA and thus reduces its peak in MR spectroscopy.
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            Financial support and sponsorship                     recurrent glioma from radiation necrosis: a systematic review
            Nil.                                                  and meta-analysis. Eur J Radiol 2014;83:2181-9.



























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