Incidence of Elevated Intracranial Pressure (ICP)

Overall

  • ~10–20% of children with single-suture craniosynostosis develop elevated intracranial pressure at some point during childhood.

  • Importantly, ICP can be present even when head shape looks mild and even after surgery.

By Suture Type (Approximate Ranges)

Sagittal Synostosis

  • 6–14%

  • Often develops later in childhood, not always in infancy

  • May be missed without surveillance

Unilateral Coronal Synostosis

  • 15–30%

  • Higher risk than sagittal

  • Frequently associated with:

    • Vision changes

    • Eye movement abnormalities

    • Asymmetric orbital growth

  • ICP may occur even after surgical correction

Metopic Synostosis

  • 10–20%

  • Risk increases with:

    • More severe trigonocephaly

    • Developmental or behavioral symptoms

Unilateral Lambdoid Synostosis

  • Rare overall

  • Higher relative ICP risk compared to sagittal

  • Often associated with posterior fossa crowding

Why These Numbers Are Likely Underestimated

Many children do not show classic signs of ICP such as papilledema or rapid head growth. Instead, they may have:

  • Vision decline (sometimes unilateral)

  • Headaches

  • Behavioral or learning changes

  • Sleep disturbance

  • Subtle developmental regression

📌 Studies that rely only on eye exams underestimate true ICP rates
📌 ICP monitoring often detects pressure when imaging and eye exams appear normal

Key Clinical Takeaways for Families

  • Single-suture does NOT mean low-risk

  • ICP can develop later, even years after surgery

  • Normal OCT or eye exam does not rule out ICP

  • Vision changes, especially new or unilateral, are a red flag

  • Symptoms matter as much as imaging

How This Is Often Explained Clinically

“While syndromic craniosynostosis carries the highest risk of intracranial hypertension, a significant percentage of children with isolated, single-suture craniosynostosis also develop elevated intracranial pressure, sometimes in the absence of classic exam findings.”