Dear Freesurfers,

I ran recon-all on a subject with extreme hydrocephalus. Registration to Talairach space and skull stripping were OK. However, a part of occipital white matter was not recognized as white matter even after adding control points and running recon-all -autorecon2-cp -autorecon3 due to the large ventricle as you can see in the attachment. What can you recommend to fix this problem? Thank you for your help!

Andrea