It is unclear why the secondary features of sagittal synostosis did not develop in these cases. Possible explanations include fusion of the suture late after the majority of skull growth has taken place and a patent metopic suture allowing growth to occur anteriorly; other sutures appeared patent radiologically but may not have been functioning normally. Although difficult to recognize, patients with isolated sagittal synostosis in the absence of scaphocephaly are important to identify because they are at high risk of developing raised intracranial pressure. A new management algorithm for treatment of these cases is described that has been used successfully in the Oxford Craniofacial Unit.
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