Cephalic index of Japanese children with normal brain development

Area of Science:

• Anthropology
• Pediatrics
• Radiology

Background:

• The cephalic index is crucial for assessing skull morphology, particularly in craniosynostosis.
• Known racial variations exist for the cephalic index, but data for Japanese populations are limited.
• Understanding cephalic indices in healthy children is essential for identifying abnormal skull development.

Purpose of the Study:

• To investigate and establish cephalic index norms for Japanese children with normal brain development.
• To compare cephalic indices in Japanese children with existing data from other racial groups.
• To provide a reference for diagnosing skull morphology abnormalities in Japanese pediatrics.

Main Methods:

• Utilized axial slice computed tomography (CT) scans from 104 Japanese children (62 males, 42 females) with normal brain development.
• Categorized participants into 7 age groups (0-3 months to 3 years).
• Calculated the cephalic index using the formula: (cephalic width/cephalic length) × 100.

Main Results:

• Cephalic indices varied across age groups, with values ranging from 83.7 to 89.2.
• The cephalic indices for Japanese children tended to be higher (more brachycephalic) than those reported for white children.
• Specific average cephalic indices were documented for each age bracket.

Conclusions:

• Japanese children with normal brain development demonstrate a tendency towards brachycephaly compared to white children.
• This study provides a foundational classification of cephalic indices for healthy Japanese children.
• The findings are vital for accurate diagnosis and management of skull morphology conditions in Japanese pediatric patients.