Abstract
Wormian bones are supernumerary bones of the skull that form as a result of extra-ossification centers during development in utero. They are a common finding that typically lie within and are surrounded by suture lines, especially the lambdoidal and coronal sutures. Wormian bones located within the fontanelles of neonates have a lower reported incidence and have been associated with various disorders such as craniosynostosis and osteogenesis imperfecta. Few reports have documented the existence of a Wormian bone in the fontanelle of an infant without complications or underlying pathology. There are limited resources or case reports that discuss a Wormian bone as a variant of normal.This report details the case of a child with an isolated Wormian bone within the anterior fontanelle discovered before discharge from hospital at birth. The child went on to have normal growth of his head circumference and did not have any further developmental complications after follow-up.
Highlights
The bones comprising the skull of a developing human do not fuse until after birth
Wormian bones located within the fontanelles of neonates have a lower reported incidence and have been associated with various disorders such as craniosynostosis and osteogenesis imperfecta
One small clinical study discussed the possibility of normal development in some children with the anterior fontanelle Wormian bone, but with many of the subjects requiring surgical intervention for craniosynostosis [7]
Summary
The bones comprising the skull of a developing human do not fuse until after birth. Wormian bones form as a result of extra ossification centers in utero. One small clinical study discussed the possibility of normal development in some children with the anterior fontanelle Wormian bone, but with many of the subjects requiring surgical intervention for craniosynostosis [7]. Parents of such children are left with minimal resources for the explanation of the finding without its relation to serious medical sequelae. This case report highlights a case of a child with the incidental finding of an anterior fontanelle Wormian bone with normal development and no medical sequelae or surgical intervention required The child, in this case, was born to a 33-year-old G2P1A1 (Gravida 2, Para 1, Abortus 1) mother.
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