Craniosynostosis is a birth defect that causes one or more sutures on a baby's head to close earlier than normal.
The skull of an infant or young child is made up of bony plates that allow for growth of the skull. The borders at which these plates intersect are called sutures or suture lines. The sutures between these bony plates normally close by the time the child is 2 or 3 years old.
Early closing of a suture causes the baby to have an abnormally shaped head.
Premature closure of sutures
Causes, incidence, and risk factors
The cause of craniosynostosis is unknown. Genes may play a role. However, there is usually no family history of the condition.
A form passed down through families (heredited) can occur with other health problems, such as seizures, decreased intelligence, and blindness. Genetic disorders commonly linked to craniosynostosis include Crouzon, Apert, Carpenter, Chotzen, and Pfeiffer syndromes.
However, most children with craniosynostosis are otherwise healthy and have normal intelligence.
Symptoms depend on the type of craniosynostosis. They may include:
No "soft spot" (fontanelle) on the newborn's skull
A raised hard ridge along the affected sutures
Unusual head shape
Slow or no increase in the head size over time as the baby grows
Types of craniosynostosis:
Sagittal synostosis (scaphocephaly) is the most common type. It affects the main suture on the very top of the head. The early closing forces the head to grow long and narrow, instead of wide. Babies with this type tend to have a broad forehead. It is more common in boys than girls.
Frontal plagiocephaly is the next most common type. It affects the suture that runs from ear to ear on the top of the head. It is more common in girls.
Metopic synostosis is a rare form that affects the suture close to the forehead. The child's head shape may be described as trigonocephaly. It may range from mild to severe.
Signs and tests
The doctor will feel the infant's head and perform a physical exam.
The following tests may be done:
Measuring the width of the infant's head
X-rays of the skull
CT scan of the head
Well-child visits are an important part of your child's health care. They allow your doctor or nurse to regularly check the growth of your infant's head over time. This will help identify any problems early.
Surgery is done while the baby is still an infant. The goals of surgery are:
Relieve any pressure on the brain
Make sure there is enough room in the skull to allow the brain to properly grow
Improve the appearance of the child's head
How well your child does depends on:
How many sutures are involved
The child's overall health
Children with this condition who have surgery usually do well, especially when the condition is not associated with a genetic syndrome.
Craniosynostosis results in head deformity that can be severe and permanent if it is not corrected. Increased intracranial pressure, seizures, and developmental delay can occur.
Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.