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Frontal bossing is a prominent, protruding forehead — it’s not typically caused by craniosynostosis itself, but when it occurs with craniosynostosis, it often reflects compensatory skull growth due to premature fusion of another suture.
Here’s how it relates to types of craniosynostosis:
| Type of Craniosynostosis | Suture Involved | Head Shape / Features | Frontal Bossing? |
|---|---|---|---|
| Sagittal synostosis (scaphocephaly) | Sagittal suture | Long, narrow skull (boat-shaped), prominent forehead and occiput | Yes – frontal bossing common |
| Coronal synostosis (unicoronal or bicoronal) | Coronal suture(s) | Flattening of the forehead on the affected side (if unilateral); short, wide head (if bilateral) | Unilateral: bossing on opposite side |
| Metopic synostosis (trigonocephaly) | Metopic suture | Triangular forehead, midline ridge | No bossing – forehead narrow instead |
| Lambdoid synostosis | Lambdoid suture | Flattened occiput, tilt of skull base | Frontal bossing on opposite side (contralateral) |
✅ Summary:
Frontal bossing is most classically seen with sagittal craniosynostosis (scaphocephaly), but can also appear contralateral to fused sutures in unicoronal or lambdoid synostosis due to compensatory growth.
Would you like me to include a quick diagram or table showing skull shapes for each type?
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