Dear Freesurfer experts,
I have used the following commandline to generate the final statistics in my analysis:
mri_segstats --seg aseg.mgz --ctab-default --i suvr.nii --mask mask.nii --sum stats.dat
The final output of this command is (attached). Depedning on the anatomical location of the mask, I expect that I will get two structures in the stats file. What is the "unknown" label means? is it CSF? Do I need to include it in my next statistcal analses?
I highly appreciate your input!