When they say “premature fusion” of the sutures in the newborn skull, how early is too early for them to fuse? At what age do they normally fuse together?
Before I answer that, let me tell you something about the normal growth of the skull. The skull grows in response to the growth of the brain. The skull grows rapidly from birth to 2 years of age when the brain reaches about 95% of its size. After 2 years of age, the skull continues to grow slowly until about 7 years of age. The sutures commonly involved in craniosynostotic deformities normally begin to close in the third decade of life (i.e., in your 20s: sagittal suture, 22 yrs of age; coronal suture, 24 yrs of age; lambdoid suture, 26 yrs of age). The premature closures that lead to craniosynostotic plagiocephaly, brachycephaly or scaphocephaly generally occur in the first year of age. So when you physicians talk about “premature closure”, they mean about 20 years too early. Kevin M.
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