Q: I have a deformity of the skull known as plagiocephaly. I stumbled across your site a few days ago and a sudden feeling of relief came over me. Craniosynostosis & Plagiocephaly Support Group. Craniosynostosis is a medical condition in which some or all of the sutures in the skull of an infant close too early, causing problems with normal brain and skull growth. Skull Base Institute is the leader in minimally invasive, fully endoscopic surgery for the treatment of Plagiocephaly. Learn more about our procedures here!