A number sign (#) is used with this entry because of evidence that Antley-Bixler syndrome with disordered steroidogenesis (ABS1) is caused by homozygous or. Antley–Bixler syndrome, also called trapezoidocephaly-synostosis syndrome, is a rare, very severe autosomal recessive congenital disorder characterized by. This page from Great Ormond Street Hospital (GOSH) explains the causes, symptoms and treatment of Antley-Bixler syndrome and where to get help.

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Evidence for digenic inheritance in some cases of Antley-Bixler syndrome? Intellectual development is variable. Causes The specific underlying cause of Antley-Bixler Syndrome remains unclear. In recessive disorders, if both parents carry the same gene for the same disease trait, there is an increased risk that their children may inherit the two genes necessary for development of the disease.

As a result, the head may appear abnormally short and broad brachycephalic and when viewed from above appears like a trapezoid. Genetic counseling will also be of benefit for individuals with Antley-Bixler Syndrome and their families.

Antley–Bixler syndrome

Gorlin RJ, et al. Antley-Bixler syndrome with radioulnar synostosis. Evidence for digenic inheritance in some cases of Antley-Bixler syndrome? Management and treatment Treatment is symptomatic, and includes early neurosurgical as well as pulmonary management.

There is a wide spectrum of anomalies seen in ABS; other features include midface hypoplasia, choanal stenosis or atresia, multiple joint contractures, visceral anomalies particularly of the genitourinary systemand impaired steroidogenesis present only in patients with POR mutations.


Inborn errors of steroid metabolism. Antley—Bixler syndromealso called trapezoidocephaly-synostosis syndrome[1] is a rare, very severe autosomal recessive [2] congenital disorder characterized by malformations and deformities affecting the majority of the skeleton and other areas of the body. Information on current clinical trials is posted on the Internet at www. Expert curators review the literature and organize it to facilitate your work. Antley-Bixler syndrome with genital anomalies and disordered antleh.

Rare Disease Database

This page was last edited on 10 Novemberat We need long-term secure funding to provide you the information that you need at your fingertips. Identification of novel roles of the cytochrome P system in early embryogenesis: Trapezoidocephaly, midface hypoplasia and cartilage abnormalities with multiple synostoses and skeletal fractures. Mental retardation is also present in children with this disorder. The surgical procedures performed will depend upon the severity of the anatomical abnormalities, their associated symptoms, and other factors.

The head has a long narrow appearance with a pointed top acrocephaly or oxycephaly and some fingers may be webbed syndactyly. Ibxler example, in those with choanal atresia or stenosis, surgery or other appropriate methods may be required to decrease the airway obstruction or correct the malformation. Carpenter Syndrome is a rare inherited disorder characterized by abnormalities of the head, hands, and genitals.

We are determined to keep this website freely accessible. Home Subscribe Feedback Login. The Antley-Bixler syndrome is a rare multiple congenital anomaly with a high mortality rate.

Orphanet: Antley Bixler syndrome

In a few individuals with symptoms characteristic of Antley-Bixler Syndrome, associated abnormalities have appeared to result from maternal use of the antifungal medication fluconazole during early pregnancy. Parents of several individuals with Antley-Bixler Syndrome have been closely related by blood consanguineous. Detailed information Professionals Clinical genetics review English Chromosomes are found in the nucleus of all body somatic cells.


The 34 affected POR alleles included 10 with alato-pro Abnormalities, Multiple, genetics,radiography,Case Report, Contracture, genetics,radiography,Craniosynostoses, genetics,radiography,Human, Infant, Male, Marfan Syndrome, genetics,radiography,Syndrome, Synostosis, genetics,radiography.

In the absence of POR, environmental toxins and drugs that are usually metabolized to benign products by hepatic P enzymes may achieve teratogenic concentrations. Prognosis The prognosis is poor with the majority of reported patients dying during infancy due to respiratory complications.

The Antley-Bixler syndrome ABS is an exceptionally rare craniosynostosis syndrome characterized by radiohumeral synostosis present from the perinatal period. They reported abnormalities of steroid biogenesis in 7 of 16 patients with an Antley-Bixler phenotype. CC ]. This condition causes the head to from a cloverleaf shape. Eur J Pediatr ; Summary and related texts. Other physical characteristics may include webbed fingers and a variety of skeletal deformities. Bottero L, et al.

Not Antley-Bixler syndrome [letter]. Such treatment may require the coordinated efforts of a team of medical professionals who may need to systematically and comprehensively plan an affected child’s treatment. Other search option s Alphabetical list. Poddevin F, et al.