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Joseph Junewick, MD FACR
over 11 years ago
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Anterior Fontanel Bone

Case Detail

Anatomy: Brain-Spine
Joseph Junewick, MD FACR
Diagnostic Category: Normal variant
Created: over 10 years ago
Updated: over 10 years ago
Tags: PEDS
Modality/Study Types: CR
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4 month old with absent “soft spot”, rule out craniosynostosis.

Case Images


Anterior Fontanelle Bone


CR – Large flat bone nearly fills the anterior fontanel.


Bones in the anterior fontanel and adjacent sutures are unusual but not uncommon normal variants. Anterior fontanel bones may be present at birth or appear later. These bones are often single, large and flat usually without diploic space. The usual mechanism for fontanel closure is centripetal marginal growth of the frontal and parietal bones; the anterior fontanel bone also exhibits centripetal marginal growth. Anterior fontanel bones do not interfere with normal skull growth or shape and become fused with the adjacent bones by 5 years of age.


Girdany BR, Blank E. Anterior Fontanel Bones. AJR (1965); 95(1):148-154.

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