Apert syndrome is a genetic disorder that causes abnormal development of the skull. Babies with Apert syndrome are born with a distorted shape of the head and face. Many children with Apert syndrome also have other birth defects. Apert syndrome has no cure, but surgery can help correct some of the problems that result.
Causes of Apert Syndrome
Apert syndrome is caused by a rare mutation on a single gene. This mutated gene is normally responsible for guiding bones to join together at the right time during development. In almost all cases, the Apert syndrome gene mutation seems to be random. Only about one in 65,000 babies is born with Apert syndrome.
Apert Syndrome Symptoms
The defective gene in babies with Apert syndrome allows the skull bones to fuse together prematurely, a process called craniosynostosis. The brain continues to grow inside the abnormal skull, putting pressure on the bones in the skull and face.
The abnormal skull and facial growth in Apert syndrome produce its main signs and symptoms:
- A head that is long, with a high forehead
- Wide-set, bulging eyes, often with poorly-closing eyelids
- A sunken middle face
Other Apert syndrome symptoms also result from the abnormal skull growth:
- Poor intellectual development (in some children with Apert syndrome)
- Obstructive sleep apnea
- Repeated ear or sinus infections
- Hearing loss
Abnormal fusion of the bones of the hands and feet (syndactyly) -- with webbed or mitten-like hands or feet -- are also common Apert syndrome symptoms. Some children with Apert syndrome also have heart, gastrointestinal, or urinary system problems.
Apert Syndrome Diagnosis
Doctors often suspect Apert syndrome or another craniosynostosis syndrome at birth because of a newborn's appearance. Genetic testing can usually identify Apert syndrome or another cause of abnormal skull formation.
Apert Syndrome Treatments
Apert syndrome has no known cure. Surgery to correct the abnormal connections between bones is the main treatment for Apert syndrome.
In general, surgery for Apert syndrome takes place in three steps:
1. Release of skull bone fusion (craniosynostosis release). A surgeon separates the abnormally fused skull bones and partially rearranges some of them. This surgery is usually performed when a child is between 6 and 8 months old.
2. Midface advancement. As the child with Apert syndrome grows, the facial bones again become misaligned. A surgeon cuts the bones in the jaw and cheeks and brings them forward into a more normal position. This surgery may be done at any time between 4 and 12 years of age. Additional corrective surgery may be needed, especially when midface advancement is done at a young age.
3. Correction of wide-set eyes (hypertelorism correction). A surgeon removes a wedge of bone in the skull between the eyes. The surgeon brings the eye sockets closer together, and may adjust the jaw too.