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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Two genetically distinct forms are observed: Urogenital anomalies with sexual ambiguity due to impaired steroidogenesis can occur.

Antley–Bixler syndrome – Wikipedia

However, according to researchers, other cases sndrome result from spontaneous sporadic genetic changes mutations that may be transmitted as an autosomal dominant trait. Comparisons may be useful for a differential diagnosis:. Premature closure of the bones sutures in the skull result in an abnormally shaped head.

Clinical description Children present with characteristic facial features, including a large domed forehead, flat nose, and midface hypoplasia with proptosis and dysplastic ears. The diagnosis of Antley-Bixler Syndrome is usually made after birth postnatally based syndgome a thorough clinical evaluation and characteristic physical findings.

In individuals with Antley-Bixler Syndrome, treatment may include surgical repair of malformations.

Antley–Bixler syndrome

Inborn errors of steroid metabolism. In individuals with disordered steroidogenesis with bony features of Antley-Bixler syndrome, including the patient reported by Kelley et al. The risk is the same for each pregnancy.


Association of multiple developmental defects and embryonic lethality with loss of microsomal NADPH-cytochrome P oxidoreductase. The head may be bixelr than normal due to accumulation of fluid hydrocephaly in the skull.

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.

Mutations found in the FGFR2 gene have been shown to cause synostosis and other formal skeletal, polydactylic and syndactylic abnormalities found in Antley—Bixler and similar disorders. Poddevin F, et al. The content of the website and databases of the National Organization for Rare Disorders NORD is copyrighted and may not be reproduced, copied, downloaded or disseminated, in any way, antldy any commercial or public purpose, without prior written authorization and approval from NORD.

Features of Antley-Bixler syndrome in an infant born to a mother with pregnancy luteoma. The severity of the symptoms and shape of the skull depend on which skull bones are prematurely closed. C ] – Some patients have only ambiguous genitalia or other evidence of disordered steroidogenesis [UMLS: Parents of several individuals with Antley-Bixler Syndrome have been closely related by blood consanguineous. Many affected infants and children also may have a prominent forehead, underdeveloped midfacial regions midfacial hypoplasiaprotruding eyes proptosis bixer, and other craniofacial abnormalities.

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Escobar LF, et al. When grown in the absence of cholesterol to stimulate cholesterol biosynthesis, cells from this patient accumulated markedly increased levels of lanosterol and dihydrolanosterol. CCC ]. Differential diagnosis A similar clinical picture is observed in patients exposed in utero to fluconazole, a lanosterol 14 alpha-demethylase inhibitor.

Orphanet: Antley Bixler syndrome

The head has a long narrow appearance with a pointed top acrocephaly or oxycephaly and some fingers may syndromme webbed syndactyly. Musculoskeletal manifestations of the Antley-Bixler syndrome.

This disorder is also known as Acrocephalosyndactyly Type V. Trapezoidocephaly, midface hypoplasia and cartilage abnormalities with multiple synostoses and skeletal fractures. Views Read Edit View history.

Achondrogenesis type 1B Autosomal recessive multiple epiphyseal dysplasia Atelosteogenesis, type II Diastrophic dysplasia. Click on image for details. Antley—Bixler syndrome presents itself at birth or prenatally. Aside from genital anomalies and disordered pattern of steroidogenesis present in patients with POR synrome, no dysmorphic feature appears to distinguish the 2 groups.