Adams-Oliver syndrome (AOS) is an extremely rare inherited disorder characterized by defects of the scalp and abnormalities of the fingers, toes, arms, and/or legs. The physical abnormalities associated with this disorder vary greatly among affected individuals. Some cases may be very mild while others may be severe. In infants with Adams-Oliver syndrome, scalp defects are present at birth (congenital) and may include one or multiple hairless scarred areas that may have abnormally wide (dilated) blood vessels directly under the affected skin. In severe cases, an underlying defect of the bones of the skull may also be present. In addition, infants with this disorder typically have malformations of the hands, arms, feet, and/or legs. These range from abnormally short (hypoplastic) fingers and toes to absent hands and/or lower legs. In some cases, additional abnormalities may also be present. Most cases of AOS appear to follow autosomal dominant inheritance but autosomal recessive inheritance has also been reported.
The physical abnormalities associated with Adams-Oliver syndrome vary greatly among affected individuals. While some cases may be very mild, others may be severe. Limb and scalp defects are the most common findings.
Infants with Adams-Oliver syndrome may exhibit one or multiple hairless scarred areas of skin on the scalp. The depth and size (diameter) of the lesions vary greatly from case to case. In some affected individuals, the scalp lesions may become ulcerated or infected. However, in most cases, these skin lesions heal without treatment (spontaneously) within the first few months of life. In some infants with Adams-Oliver syndrome, abnormally wide (dilated) blood vessels may be apparent under the skin lesions. In severe cases, these fragile dilated blood vessels may bleed (hemorrhage).
In severe cases, the scalp and vascular defects described above may be associated with an underlying bone defect, including absence of bone in certain areas of the skull. In very severe cases, certain tissues beneath the skull may become exposed, resulting in increased susceptibility to excessive bleeding (hemorrhage) and/or bacterial infections such as meningitis. The scalp defects associated with Adams-Oliver syndrome resemble aplasia cutis congenita. (For more information on meningitis and aplasia cutis congenita, see the Related Disorders section of this report.)
Infants with Adams-Oliver syndrome also exhibit malformations of the fingers, toes, hands, and/or feet. Some affected infants may have abnormally short fingers and/or toes (digits) due to underdevelopment (hypoplasia) or absence of certain bones in the hands and/or feet (metacarpals and/or phalanges [terminal]). In severe cases, the fingers, toes, hands, feet, and/or lower legs may be partially or completely absent. Affected individuals may also have webbing of toes (syndactyly) and underdeveloped (hypoplastic) toenails. In general, the lower extremities (i.e., lower legs, feet, and toes) are more severely affected.
Approximately 20 percent of infants with Adams-Oliver syndrome may have an associated heart defect that is present at birth (congenital heart defect) such as ventricular septal defects (VSDs). The normal heart has four chambers. The two upper chambers, known as atria, are separated from each other by a fibrous partition known as the atrial septum. The two lower chambers are known as ventricles and are separated from each other by the ventricular septum. Valves connect the atria (left and right) to their respective ventricles. The aorta, the main vessel of arterial circulation, carries blood away from the left ventricle to the rest of the body. A VSD may occur in any portion of the ventricular septum. The size and location of the defect determine the severity of the symptoms. A small ventricular septal defect may close on its own (spontaneously) or become less significant as the child matures and grows. A moderately-sized defect may affect the ability of the heart to pump blood efficiently to the lungs and the rest of the body (congestive heart failure). Symptoms associated with heart failure may include an abnormally rapid rate of breathing (tachypnea), wheezing, an unusually fast heartbeat (tachycardia), failure to grow at the expected rate (failure to thrive), and/or other findings.
Additional congenital heart defects sometimes associated with Adams-Oliver syndrome may include atrial septal defects (ASDs); a double-outlet right ventricle, a condition in which both the aorta (AO) and pulmonary artery (PA) improperly arise from the right ventricle; and a condition known as tetralogy of Fallot. (For more information on this disorder, choose “Tetralogy of Fallot” in the Rare Disease Database.)
Additional findings have been reported in children with Adams-Oliver syndrome including central nervous system abnormalities and high blood pressure of the main artery of the lungs (pulmonary hypertension). In some cases, affected children also develop a disorder known as cutis marmorata telangiectatica congenita (CMTC). (For more information on CMTC, see the Related Disorders section of this report).
Most cases of AOS appear to follow autosomal dominant inheritance. Dominant genetic disorders occur when only a single copy of an abnormal gene is necessary to cause a particular disease. The abnormal gene can be inherited from either parent or can be the result of a new mutation (gene change) in the affected individual. The risk of passing the abnormal gene from affected parent to offspring is 50% for each pregnancy. The risk is the same for males and females.
The physical findings associated with Adams-Oliver syndrome (e.g, scalp defects and abnormalities of the fingers, toes, arms, and/or legs) may vary greatly in severity from case to case (variable expressivity). In addition, all of the characteristics associated with this disorder may not be manifested in all those who inherit the gene (incomplete penetrance).
Autosomal recessive inheritance has also been reported. Recessive genetic disorders occur when an individual inherits two copies of an abnormal gene for the same trait, one from each parent. If an individual receives one normal gene and one gene for the disease, the person will be a carrier for the disease but usually will not show symptoms. The risk for two carrier parents to both pass the defective gene and have an affected child is 25% with each pregnancy. The risk to have a child who is a carrier like the parents is 50% with each pregnancy. The chance for a child to receive normal genes from both parents and be genetically normal for that particular trait is 25%. The risk is the same for males and females.
All individuals carry 4-5 abnormal genes. Parents who are close relatives (consanguineous) have a higher chance than unrelated parents to both carry the same abnormal gene, which increases the risk to have children with a recessive genetic disorder.
Some researchers believe that the physical characteristics associated with Adams-Oliver syndrome may be the result of interrupted blood flow through certain arteries during fetal development. The term “Subclavian Artery Supply Disruption Sequence (SASDS)” has been suggested for a group of developmental disorders that may occur due to disruption of blood flow through certain arteries (i.e., subclavian artery, vertebral artery, and/or various arterial branches) during fetal development. These disorders include Poland syndrome, Klippel-Feil syndrome, Moebius syndrome, and Sprengel deformity.
Adams-Oliver syndrome is an extremely rare disorder that appears to affect males and females in equal numbers. More than 125 affected individuals have been reported in the medical literature. The major physical features of Adams-Oliver syndrome (i.e., scalp defects and limb abnormalities) are apparent at birth (congenital).
The diagnosis of Adams-Oliver syndrome may be suspected at birth based upon the identification of characteristic scalp and skull defects occurring in association with malformations of the fingers, toes, hands, and/or feet. The diagnosis may be confirmed by a thorough clinical evaluation, a detailed patient history, and a variety of specialized tests, such as advanced imaging techniques. In some cases, it may be possible to detect defects of the skull and/or limbs before birth (prenatally) through the use of advanced imaging techniques such as ultrasound. During fetal ultrasonography, reflected sound waves are used to create an image of the developing fetus.
The treatment of Adams-Oliver syndrome is directed toward the specific symptoms that are apparent in each individual. Treatment may require the coordinated efforts of a team of specialists. Pediatricians, orthopedic and plastic surgeons, cardiologists, physical therapists, and other health care professionals may need to systematically, and comprehensively plan an affected child's treatment.
In many cases, scalp defects may heal without treatment (spontaneously) within the first few months of life. Skin grafting, cranial surgery, and/or other surgical procedures may be required for affected individuals who exhibit underlying defects of the bones of the skull. In addition, physicians may recommend that some affected children wear helmets in order to prevent trauma to the head and potential damage to abnormally wide (dilated) blood vessels.
Physical therapy, surgery, and/or the use of artificial limbs (prostheses) may be recommended for children who exhibit partial or complete absence of fingers, toes, hands, feet, and/or lower legs.
In addition, affected children should receive a complete medical evaluation for heart (cardiac) abnormalities that are sometimes associated with this Adams-Oliver syndrome.
Genetic counseling will be of benefit for affected individuals and their families. Family members of affected individuals should also receive regular clinical evaluations to detect any symptoms and physical characteristics that may be potentially associated with Adams-Oliver syndrome. Other treatment for this disorder is symptomatic and supportive.
Information on current clinical trials is posted on the Internet at www.clinicaltrials.gov. All studies receiving U.S. government funding, and some supported by private industry, are posted on this government website.
For information about clinical trials being conducted at the National Institutes of Health (NIH) in Bethesda, MD, contact the NIH Patient Recruitment Office:
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(Please note that some of these organizations may provide information concerning certain conditions potentially associated with this disorder [e.g., skin abnormalities, limb and skull defects, etc.].)
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