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

Pfeiffer syndrome

Pfeiffer syndrome is a genetic disorder characterized by the premature fusion of skull bones, which affects the shape of the head and face, as well as the development of bones in the hands and feet.

Overview

Pfeiffer 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. Pfeiffer syndrome also affects bones in the hands and feet.

Symptoms

Many of the characteristic facial features result from the premature fusion of skull bones. Abnormal growth leads to a high forehead, an underdeveloped upper jaw, a beaked nose, and bulging eyes. More than half of all children with the condition experience hearing loss, and dental problems are common.

In the hands and feet, the thumbs and first (big) toes are wide and bend away from the other digits. Short fingers and toes (brachydactyly) are common, and there may be some webbing between the digits (syndactyly).

Subtypes

Pfeiffer syndrome is divided into three subtypes:

  • Type 1 (Classic): Most individuals have normal intelligence and a normal life span.
  • Types 2 and 3: These are more severe forms that often involve nervous system problems. Premature fusion of skull bones can limit brain growth, leading to delayed development. Individuals may experience joint fusion (ankylosis) in the elbows or other joints, and airway abnormalities that can cause life-threatening breathing problems. Type 2 is distinguished from Type 3 by the presence of a cloverleaf-shaped skull caused by extensive bone fusion.

Causes

Pfeiffer syndrome is most commonly caused by mutations in the FGFR2 gene. Mutations in the FGFR1 gene cause a small percentage of Type 1 cases but have not been associated with Types 2 or 3.

These genes provide instructions for making proteins that signal immature cells to become bone cells during embryonic development. Mutations alter these proteins, causing prolonged signaling that promotes premature fusion of skull bones and affects limb development.

Inheritance

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

Frequently Asked Questions

Individuals with Type 1 Pfeiffer syndrome, the most common and mildest form, typically have normal intelligence and a normal life expectancy. They can lead independent lives, though they may require ongoing monitoring for dental issues, hearing loss, and speech delays. However, long-term follow-up is essential for all types to monitor for potential complications such as recurrent sinus infections, vision problems due to eye bulging, and joint issues. For Types 2 and 3, which are more severe, life expectancy is reduced due to potential brain growth restrictions, airway difficulties, and other systemic complications, requiring more intensive, lifelong medical management.
Most cases of Pfeiffer syndrome occur sporadically, meaning they happen by chance due to a new mutation in the FGFR2 gene and are not inherited from a parent. In these cases, the risk of having another child with the condition is very low, typically less than 1 percent. However, if a parent carries a mutation in the FGFR2 gene, the condition is inherited in an autosomal dominant pattern, meaning there is a 50 percent chance that each child will inherit the mutation. Genetic counseling is recommended for families to determine the specific inheritance pattern and assess recurrence risks.
Pfeiffer syndrome is often suspected during prenatal ultrasound if the skull shape appears abnormal or if there are signs of restricted brain growth. After birth, diagnosis is confirmed through a physical examination of the head, face, hands, and feet, combined with genetic testing. Genetic testing looks for specific mutations in the FGFR2 gene, which is the most common cause. In some cases, if genetic testing is inconclusive, a clinical diagnosis is made based on the distinct physical features, such as the broad thumbs and toes and the characteristic head shape.
Surgical treatment usually begins in infancy to address the most critical issues. Cranial vault remodeling is performed to reshape the skull and create space for the growing brain, which helps prevent increased intracranial pressure. This is often combined with midface advancement to correct the underdeveloped upper jaw and improve breathing and feeding. Additional surgeries may be needed to correct airway abnormalities, such as a narrow nasal passage or cleft palate, and to address hand and foot deformities if they interfere with function. The timing and extent of surgery depend on the severity of the subtype, with Type 1 typically requiring less extensive intervention than Types 2 and 3.
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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