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Crouzon syndrome
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

Crouzon syndrome

Crouzon syndrome is a genetic disorder characterized by the premature fusion of certain skull bones, which affects the shape of the head and face.

Overview

Crouzon syndrome is a genetic disorder characterized by the premature fusion of certain skull bones (craniosynostosis). This early fusion prevents the skull from growing normally and affects the shape of the head and face.

Symptoms

Many features of Crouzon syndrome result from the premature fusion of the skull bones. Abnormal growth of these bones leads to the following signs and symptoms:

  • Wide-set, bulging eyes and vision problems caused by shallow eye sockets
  • Eyes that do not point in the same direction (strabismus)
  • A beaked nose
  • An underdeveloped upper jaw
  • Dental problems
  • Hearing loss, sometimes accompanied by narrow ear canals
  • An opening in the lip and the roof of the mouth (cleft lip and palate) in some individuals

The severity of these signs and symptoms varies among affected people. Individuals with Crouzon syndrome usually have normal intelligence.

Frequency

Crouzon syndrome is seen in about 16 per million newborns. It is the most common craniosynostosis syndrome.

Causes

Mutations in the FGFR2 gene cause Crouzon syndrome. This gene provides instructions for making a protein called fibroblast growth factor receptor 2. Among its multiple functions, this protein signals immature cells to become bone cells during embryonic development. Mutations in the FGFR2 gene are thought to result in production of an FGFR2 protein with overactive signaling, which causes the bones of the skull to fuse prematurely.

Inheritance

This condition is inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder.

Frequently Asked Questions

Most surgeons aim to perform cranial vault remodeling or fronto-orbital advancement before the child is 12 months old, often between 6‑9 months, to allow normal brain growth and reduce the risk of increased intracranial pressure.
Mild strabismus or ocular misalignment may be managed with glasses, prism lenses, or vision therapy, but deep‑set eyes and optic nerve compression usually require orbital decompression or fronto‑orbital surgery to prevent permanent vision loss.
Crouzon syndrome is autosomal dominant, so each pregnancy carries a 50 % chance of inheriting the FGFR2 mutation. Prenatal diagnosis is possible through chorionic villus sampling or amniocentesis if the specific familial mutation is known, and pre‑implantation genetic testing (PGT‑M) can be used with IVF to select embryos without the mutation.
Regular audiologic evaluations (every 6‑12 months) are essential. If conductive hearing loss from narrow ear canals develops, tympanostomy tubes or bone‑anchored hearing aids may be recommended; speech‑language therapy can help mitigate any language delays.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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