Geometric Morphometric Study on Distinguishing Metopic Craniosynostosis from Metopic Ridging

Area of Science:

• Craniofacial development
• Congenital anomalies
• Geometric morphometrics

Background:

• Craniosynostosis is premature fusion of cranial sutures, with trigonocephaly (metopic suture fusion) diagnosis being controversial.
• Mild trigonocephaly presents diagnostic challenges, necessitating further investigation into its underlying morphology.
• Distinguishing pathological metopic suture synostosis from normal variations is crucial for accurate diagnosis.

Purpose of the Study:

• To determine if a metopic ridge in mild trigonocephaly is a pathological indicator using geometric morphometric analysis.
• To differentiate between true trigonocephaly, mild trigonocephaly, and normal cranial morphology.
• To clarify the diagnostic criteria for metopic suture synostosis.

Main Methods:

• Comparison of three cranial morphologies (true, mild, normal trigonocephaly) in patients up to 2 years old.
• Utilized computed tomography (CT) scans to plot 235 anatomical landmarks on the cranial surface.
• Applied geometric morphometrics and principal component analysis to analyze neurocranial shape variations.

Main Results:

• Principal component analysis showed no significant cranial morphology differences between mild trigonocephaly and normal skulls.
• True trigonocephaly exhibited significant morphological differences compared to both mild trigonocephaly and normal skulls.
• Endocranial, frontal, and occipital bone shapes did not significantly differ between mild trigonocephaly and normal groups.

Conclusions:

• A metopic ridge alone is not sufficient for diagnosing a fundamentally pathological condition in mild trigonocephaly.
• The findings suggest that a metopic ridge can represent normal cranial morphology.
• This study aids in refining the diagnosis of metopic suture synostosis by differentiating pathological from normal variations.