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Table 1: NAA/Cr and Cho/Cr ratios before and after surgery^{^a}
Before Surgery After Surgery P Value
NAA/Cr ratio 
    Ipsilateral hemisphere 1.654 ± 0.195 1.660 ± 0.228 .2819
    Contralateral hemisphere 1.720 ± 0.177 1.718 ± 0.190 .9694
Cho/Cr ratio 
    Ipsilateral hemisphere 0.895 ± 0.109 0.888 ± 0.104 .3132
    Contralateral hemisphere 0.868 ± 0.093 0.867 ± 0.095 .8760
↵a Values are expressed as means.

	Before Surgery	After Surgery	P Value
NAA/Cr ratio
Ipsilateral hemisphere	1.654 ± 0.195	1.660 ± 0.228	.2819
Contralateral hemisphere	1.720 ± 0.177	1.718 ± 0.190	.9694
Cho/Cr ratio
Ipsilateral hemisphere	0.895 ± 0.109	0.888 ± 0.104	.3132
Contralateral hemisphere	0.868 ± 0.093	0.867 ± 0.095	.8760