Fig 1.

Colored white matter tracts rendered for a patient with a falx meningioma (yellow) on the right hemisphere near the location of the precentral primary motor cortex, superimposed on a coronal T2-weighted image. Blue is used for the corticospinal tracts, for which the right-sided fiber bundles are displaced by the presence of the meningioma. Note that though differential diagnosis for meningioma is relatively straightforward using conventional T1- and T2-weighted MR imaging, hence making diffusion MR tractography unnecessary, the example shown here at least demonstrates the validity of the displaced tracts reconstructed from DTI data.