The coronal suture is the fibrous joint line that runs across the top of the skull from side to side, separating the frontal bone in front from the two parietal bones behind. It meets the sagittal suture in the midline at bregma and ends on each side near the pterion. In the newborn the anterior fontanelle sits where it crosses the midline.
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| Ossification | A fibrous joint between bones that ossify in membrane; it stays open through childhood growth and usually begins to fuse in adult life, often not until the fourth decade or later. |
Premature fusion of the coronal suture (coronal craniosynostosis) is the second most common single-suture synostosis. Fusion on one side flattens the forehead and raises the eye socket on that side (anterior plagiocephaly), while fusion on both sides produces a short, broad, tall skull (brachycephaly) and is often part of syndromes such as Crouzon, Apert and Muenke. On skull X-rays and CT the suture must not be mistaken for a fracture, and a fracture line running into it can separate the bones (diastatic fracture).
Early fusion of one or both halves of the coronal suture, causing a flattened forehead and asymmetric orbits on the affected side or a short, broad skull when both sides fuse; usually treated with cranial vault remodelling in infancy.
A fracture that extends into and widens a suture, most often in young children, seen on imaging as separation of the bone edges.
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