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Dear FS Mailing list,

I have not yet receive a reply to my previous question, which was as follows:

I am currently reviewing and editing a large set of sMRI scans in FS version 8.1. I've noticed that while the pial surface sometimes includes dura and non-brain that can be edited away, the aparc accurately aligns to the surface of the brain and doesn't need editing. If the aparc is accurate, do I still need to edit the pial surface when non-brain is included?

To add additional context, this issue is often evident in the lateral occipital or entorhinal regions.

Kind regards,

Bronwyn. ________________________________ From: Bronwyn Overs b.overs@neura.edu.au Sent: Friday, 8 May 2026 09:41 To: list, Freesurfer freesurfer@nmr.mgh.harvard.edu Subject: When is a pial surface edit required

Dear FS mailing list,

I am currently reviewing and editing a large set of sMRI scans in FS version 8.1. I've noticed that while the pial surface sometimes includes dura and non-brain that can be edited away, the aparc accurately aligns to the surface of the brain and doesn't need editing. If the aparc is accurate, do I still need to edit the pial surface when non-brain is included?

Kind regards,

Bronwyn.