Hello All,

Looking at aparc+aseg of some subjects we see some regions of the cortex labeled as "unknown" especially in the medial region / temporal lobe, close to amygdala. Additionally, around these regions there are some regions of the cortex that are not labeled at all. We see this on images acquired on both 1.5T and 3T magnets, with poor and good SNR.

I was wondering what this "unknown" regions refer to, and if there is a way to fix this (using control points, or manual editing etc.)

Thanks in advance. Deniz