Preoperative anthropometric dysmorphology in metopic synostosis

Area of Science:

• Craniofacial surgery
• Anthropometry
• Pediatric genetics

Background:

• Metopic synostosis is a premature closure of the metopic suture, a rare craniosynostosis affecting approximately 4% of cases.
• This condition leads to characteristic craniofacial and cranial vault abnormalities, particularly affecting the upper face and orbits.

Purpose of the Study:

• To quantitatively identify and characterize the craniofacial dysmorphology associated with primary (nonsyndromal) metopic synostosis.
• To compare anthropometric data from patients with metopic synostosis to normal controls.

Main Methods:

• Anthropometric examination of 50 patients diagnosed with primary metopic synostosis.
• Calculation of 11 proportion indices from 24 anthropometric measurements.
• Comparison of patient data to sex- and age-matched normal students using standard (Z) scores and Student's t-test.

Main Results:

• Metopic synostosis results in a complex pattern of dysmorphology affecting the cranial vault, upper face, and orbits.
• Statistically significant narrowing of the fronto-orbito-zygomatic complex and reduced vertex height were observed.
• Compensatory growth patterns include increased sagittal and transverse growth of the posterior neurocranium and vertical/sagittal growth of the upper face.

Conclusions:

• Metopic synostosis induces significant and complex craniofacial alterations.
• Age at presentation influences the pattern of dysmorphology, with significant differences observed between infants and older children.
• No significant sex-based differences in dysmorphology patterns were found.