Top row: In metopic craniosynostosis, the metopic suture that passes down the middle of the forehead fuses prematurely. This results in a narrow forehead that forms with a ridge down the suture. In an attempt to compensate, the skull grows in a way that pushes the forehead forward. Bottom row: sagittal craniosynostosis results from the premature fusion of the sagittal suture along the top of the skull. As a result, the skull stays narrow and extends toward the front and back to compensate.