Craniosynostosis anomalies in twins.

Area of Science:

• Medical Genetics
• Reproductive Medicine
• Pediatric Surgery

Background:

• Craniosynostosis, the premature fusion of skull sutures, affects approximately 1 in 2,100 live births for nonsyndromic cases and varies for syndromic types.
• The general twinning rate is around 2.5% of live births.
• Previous reports suggest a potentially elevated twinning incidence in nonsyndromic craniosynostosis, but definitive data is lacking.

Purpose of the Study:

• To investigate and report the incidence of twinning in both nonsyndromic and syndromic craniosynostosis.
• To compare twinning rates between these patient groups and the general population.
• To explore potential explanations for observed differences in twinning incidence.

Main Methods:

• Literature review and analysis of existing epidemiological data on craniosynostosis and twinning.
• Calculation of estimated incidence rates for twinning in syndromic craniosynostosis based on prevalence data.
• Comparison of reported twinning frequencies in nonsyndromic craniosynostosis with general population rates.

Main Results:

• The incidence of twinning in nonsyndromic craniosynostosis appears higher than the general population rate, estimated between 2.5 and 19 per 210,000 live births.
• For syndromic craniosynostosis, the incidence of twinning is challenging to ascertain due to the rarity of conditions like Muenke's syndrome and Apert's syndrome.
• Theoretical estimates suggest very low twinning incidences for specific syndromic craniosynostosis cases, such as 2.5 per million for Muenke's syndrome.

Conclusions:

• A higher incidence of twinning may be associated with nonsyndromic craniosynostosis, though the underlying mechanism remains unclear.
• Determining the precise twinning incidence in syndromic craniosynostosis requires further extensive research due to low prevalence.
• This study highlights the complex relationship between twinning and craniosynostosis, necessitating continued investigation.