Pfeiffer syndrome

Pfeiffer syndrome is a rare genetic disorder characterized by the premature fusion of certain skull bones (craniosynostosis), broad and medially deviated thumbs and great toes, and variable degrees of syndactyly (webbing) of the hands and feet. It belongs to a group of conditions known as craniosynostosis syndromes and is caused by gain-of-function mutations in the FGFR1 (fibroblast growth factor receptor 1) gene on chromosome 8 or, more commonly, the FGFR2 gene on chromosome 10. The condition affects multiple body systems, including the skeletal, central nervous, and respiratory systems. Pfeiffer syndrome is classified into three clinical subtypes. Type 1 (classic Pfeiffer syndrome) is the mildest form, featuring bicoronal craniosynostosis resulting in brachycephaly, midface hypoplasia, broad thumbs and great toes, and generally normal to near-normal intelligence. Types 2 and 3 are more severe. Type 2 is characterized by a cloverleaf skull deformity (Kleeblattschädel), severe proptosis (bulging eyes), and significant neurological complications. Type 3 is similar to Type 2 but without the cloverleaf skull, and both severe forms carry a higher risk of early death due to respiratory compromise, increased intracranial pressure, and brain abnormalities. Additional features across subtypes may include hearing loss, hydrocephalus, dental abnormalities, and elbow ankylosis or other limb anomalies. There is no cure for Pfeiffer syndrome, and management is multidisciplinary. Treatment typically involves staged surgical interventions, including cranial vault remodeling to relieve intracranial pressure, midface advancement surgery to address airway obstruction and proptosis, and hand and foot surgery to improve function. Tracheostomy may be required in severe cases to maintain the airway. Long-term care involves craniofacial surgeons, neurosurgeons, ophthalmologists, otolaryngologists, audiologists, and developmental specialists. Outcomes vary significantly by subtype, with Type 1 patients generally having a favorable prognosis, while Types 2 and 3 are associated with substantial morbidity and mortality.

Common questions about Pfeiffer syndrome