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FIG 1. Sagittal SPGR images of a left frontal astrocytoma centered in the left subcentral gyrus and IFG. The tumor displaces the pars opercularis of the left IFG superiorly and anteriorly, as demarcated by the displaced inferior frontal sulcus (arrows). The lower central sulcus (CS), precentral sulcus (Pre-CS), precentral gyrus, and postcentral gyrus are displaced superiorly and posteriorly.
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