Fig 4. Shown are boxplots of FpV, FA, and MD values for the section of the ipsilateral and contralateral pyramidal tracts (A, B, and C, respectively) corresponding with the MRSI section, respectively. Boxplots of molar concentrations of NAA, Cho, and the Cho/NAA ratio averaged over voxel positions located at the ipsilateral and contralateral pyramidal tract cross sections (D, E, and F, respectively). MD values are expressed in units x 10–3 mm2/s. NAA and Cho values are are expressed in millimoles per liter. Overlaid are the P values calculated from a 2-sided paired t test.