I tried using mri_segstats on the .mgz file like this to create the stats file as this is what I do for my dt_recon results however it doesn't seem to work when I just want the volume stats?

mri_segstats --seg /Volumes/DANIEL/freesurf/${cond}.${subj}.long.base_${subj}/mri/lh.hippoAmygLabels-T1.long.v21.HBT.FSvoxelSpace.mgz --ctab /Applications/freesurfer_dev/FreeSurferColorLUT.txt --id 226 --id 231 --id 232 --sum ${SUBJECTS_DIR}/${cond}.${subj}/stats/lhipp_volume.stats

Any ideas on how to make this work or a potential other work around.

Best,