Figure 4.

DT MRI metrics of the CST in healthy controls, classic ALS and LMND patients. Mean diffusivity and radial diffusivity values of the corticospinal tracts of healthy controls and patient groups are plotted. Abbreviations. ALS: amyotrophic lateral sclerosis; CST: corticospinal tract; KD: Kennedy's disease; L: left; LMNDf: fast‐progressing lower motor neuron disease; LMNDs: slow‐progressing lower motor neuron disease; MD: mean diffusivity; radD: radial diffusivity; R: right [Color figure can be viewed at http://wileyonlinelibrary.com]