DTI fiber tracks reveal the course of the corticospinal tract along the border of a brain tumor (blue). DTI fiber tracks reveal the course of the corticospinal.

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DTI fiber tracks reveal the course of the corticospinal tract along the border of a brain tumor (blue). DTI fiber tracks reveal the course of the corticospinal tract along the border of a brain tumor (blue). Streamlines were launched from wrist (green) and shoulder (red) motor stimulation sites on the cortex. The wrist and shoulder motor streamlines twist about each other as they descend from the cortex through the internal capsule to the cerebral peduncle. P. Mukherjee et al. AJNR Am J Neuroradiol 2008;29:632-641 ©2008 by American Society of Neuroradiology