Supra Occipital Flattening: A Key Sign for Antenatal Diagnosis of Isolated Sagittal Craniosynostosis.
Paola Quaresima, Lorenzo Figà Talamanca, Lech Dudarewicz et al.
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From the abstract
Craniosynostosis is an isolated finding in most cases, involving either the metopic or the sagittal suture. It is detected only sporadically during prenatal ultrasound, in the third trimester for non-isolated cases.