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Premature ossified cranial sutures of infants (craniosynostis) may lead
to skull deformities in the growth process. Surgical interventions are required
to improve the patients' appearance and prevent skull deformation and Brain
damage by increased ICP.
Crouzon and Apert syndromes are the most common of the craniosynostosis
syndromes. Craniosynostosis refers to the early closing of one or more of
the sutures of an infant's head. The skull is normally composed of bones
which are separated by sutures.
As in infant's brain grows, open sutures allow the skull to expand and develop
a relatively normal head shape. If one or more of the sutures has closed
early, it causes the skull to expand in the direction of the open sutures.
This can result in an abnormal head shape. In severe cases, this condition
can also cause increased pressure on the growing brain. The coronal suture
goes from ear to ear on the top of the head and fusion of both sides (bicoronal
synostosis or brachycephaly) results in a very flat, recessed forehead.
This is the suture fusion found most often in Crouzon and Apert Syndromes.
Shape of the Skull depend upon the suture or sutures fuse.Skull shape can
short, wide elongate or depressed forehead.
In addition to craniosynostosis these children also have fusion of the
sutures or bones in the cranial base and midface, and shallow eye sockets.
This gives the appearance of a flat midface and eyes which protrude. In
addition, children with Apert Syndrome have syndactaly (webbing) of the
hands and feet.Crouzon Syndrome occurs in approximately 1 in 25,000 births.
It may be transmitted as an autosomal dominant genetic condition or appear
as a fresh mutation (no affected parents). The appearance of an infant with
Crouzons can vary in severity from a mild presentation with subtle midface
characteristics to severe forms with multiple cranial sutures fused and
marked midface and eye problems.
The incidence of Apert syndrome is approximately 1 in 100,000 births and
most cases are fresh mutations. The general features of a child with Apert
syndrome are similar to those in Crouzon syndrome however there is not as
much variability between cases and the degree of presentation is more severe.
TREATMENT
Treatment in infancy is directed at correction of the suture fusion and
resultant misshapen head.
Surgical treatment of the midface deformity is usually done during the pre-school
period (age 4-6 yrs).
Conventional surgical advancement of the midface requires numerous cuts
of the facial bones and advancing the midface region to a predetermined
level. This usually requires bone grafts. Plates and screws are used to
stabilize the new position. The past several years have seen a significant
increase in treatment using a technique called Osteogenic Distraction. The
same surgical boney cuts are performed and an expansion device is inserted,
where by gradual advancement of the midface region can be obtained. Research
has indicated this may provide a more stable correction.
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