National Center for Advancing and Translational Sciences Genetic and Rare Diseases Information Center, a program of the National Center for Advancing and Translational Sciences

Antley Bixler syndrome



Other Names:
Trapezoidocephaly synostosis syndrome; Multisynostotic osteodysgenesis with long bone fractures; Osteodysgenesis, multisynostotic with fractures
Categories:

Antley Bixler syndrome is a rare condition that is primarily characterized by craniofacial abnormalities and other skeletal problems. The signs and symptoms vary significantly from person to person but may include craniosynostosis; midface hypoplasia (underdeveloped middle region of the face); frontal bossing; protruding eyes; low-set, unusually-formed ears; choanal atresia or stenosis (narrowing); fusion of adjacent arm bones (synostosis); joint contractures; arachnodactyly; bowing of the thigh bones; and/or urogenital (urinary tract and genital) abnormalities. The exact underlying cause of Antley Bixler syndrome is unknown in many cases; however, some are due to changes (mutations) in the FGFR2 gene or the POR gene. There appear to be autosomal dominant and autosomal recessive forms of the condition. Treatment is based on the signs and symptoms present in each person.[1][2][3]
Last updated: 6/16/2015

This table lists symptoms that people with this disease may have. For most diseases, symptoms will vary from person to person. People with the same disease may not have all the symptoms listed. This information comes from a database called the Human Phenotype Ontology (HPO) . The HPO collects information on symptoms that have been described in medical resources. The HPO is updated regularly. Use the HPO ID to access more in-depth information about a symptom.

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Medical Terms Other Names
Learn More:
HPO ID
80%-99% of people have these symptoms
Abnormality of cardiovascular system morphology 0030680
Abnormality of the ribs
Rib abnormalities
0000772
Anteverted nares
Nasal tip, upturned
Upturned nasal tip
Upturned nose
Upturned nostrils
[ more ]
0000463
Arachnodactyly
Long slender fingers
Spider fingers
[ more ]
0001166
Brachycephaly
Short and broad skull
0000248
Camptodactyly of finger
Permanent flexion of the finger
0100490
Delayed cranial suture closure 0000270
Elbow ankylosis 0003070
Femoral bowing
Bowed thighbone
0002980
Frontal bossing 0002007
Hypoplasia of the zygomatic bone
Cheekbone underdevelopment
Decreased size of cheekbone
Underdevelopment of cheekbone
[ more ]
0010669
Joint stiffness
Stiff joint
Stiff joints
[ more ]
0001387
Low-set, posteriorly rotated ears 0000368
Narrow chest
Low chest circumference
Narrow shoulders
[ more ]
0000774
Narrow pelvis bone 0003275
Short nose
Decreased length of nose
Shortened nose
[ more ]
0003196
30%-79% of people have these symptoms
Abnormal renal morphology
Abnormally shaped kidney
Kidney malformation
Kidney structure issue
Structural kidney abnormalities
[ more ]
0012210
Choanal atresia
Blockage of the rear opening of the nasal cavity
Obstruction of the rear opening of the nasal cavity
[ more ]
0000453
Craniosynostosis 0001363
Proptosis
Bulging eye
Eyeballs bulging out
Prominent eyes
Prominent globes
Protruding eyes
[ more ]
0000520
5%-29% of people have these symptoms
Ambiguous genitalia
Ambiguous external genitalia
Ambiguous external genitalia at birth
Intersex genitalia
[ more ]
0000062
Cleft palate
Cleft roof of mouth
0000175
Downslanted palpebral fissures
Downward slanting of the opening between the eyelids
0000494
Hypertelorism
Wide-set eyes
Widely spaced eyes
[ more ]
0000316
Long philtrum 0000343
Narrow mouth
Small mouth
0000160
Recurrent fractures
Increased fracture rate
Increased fractures
Multiple fractures
Multiple spontaneous fractures
Varying degree of multiple fractures
[ more ]
0002757
Strabismus
Cross-eyed
Squint
Squint eyes
[ more ]
0000486
Talipes 0001883
Turricephaly
Tall shaped skull
Tower skull shape
[ more ]
0000262
Underdeveloped supraorbital ridges
Flattened bony protrusion above eyes
0009891
Percent of people who have these symptoms is not available through HPO
Abnormality of the endocrine system 0000818
Abnormality of the pinna
Abnormally shaped ears
Auricular malformation
Deformed ears
Malformed ears
[ more ]
0000377
Anteriorly placed anus 0001545
Arnold-Chiari malformation 0002308
Atrial septal defect
An opening in the wall separating the top two chambers of the heart
Hole in heart wall separating two upper heart chambers
[ more ]
0001631
Autosomal dominant inheritance 0000006
Autosomal recessive inheritance 0000007
Bifid scrotum
Cleft of scrotum
0000048
Bronchomalacia 0002780
Camptodactyly
Permanent flexion of the finger or toe
0012385
Carpal synostosis 0009702
Choanal stenosis
Narrowing of the rear opening of the nasal cavity
0000452
Chordee 0000041
Clitoral hypertrophy
Enlarged clitoris
0008665
Cloverleaf skull 0002676
Conductive hearing impairment
Conductive deafness
Conductive hearing loss
[ more ]
0000405
Coronal craniosynostosis 0004440
Cryptorchidism
Undescended testes
Undescended testis
[ more ]
0000028
Decreased circulating progesterone
Decreased serum progesterone
0008233
Depressed nasal bridge
Depressed bridge of nose
Flat bridge of nose
Flat nasal bridge
Flat, nasal bridge
Flattened nasal bridge
Low nasal bridge
Low nasal root
[ more ]
0005280
Elevated circulating 17-hydroxyprogesterone 0031213
Flexion contracture
Flexed joint that cannot be straightened
0001371
Fused labia minora
Fused inner lips
0000063
Hemivertebrae
Missing part of vertebrae
0002937
Horseshoe kidney
Horseshoe kidneys
0000085
Humeroradial synostosis
Fusion of upper and lower arm bones
0003041
Hydrocephalus
Too much cerebrospinal fluid in the brain
0000238
Hypoplastic labia majora
Small labia majora
Underdeveloped vaginal lips
[ more ]
0000059
Hypospadias 0000047
Increased circulating ACTH level
High blood corticotropin levels
0003154
Intellectual disability
Mental deficiency
Mental retardation
Mental retardation, nonspecific
Mental-retardation
[ more ]
0001249
Joint contracture of the hand 0009473
Labial hypoplasia
Underdeveloped labia
0000066
Lambdoidal craniosynostosis 0004443
Laryngomalacia
Softening of voice box tissue
0001601
Low maternal serum estriol 0008073
Malar flattening
Zygomatic flattening
0000272
Maternal virilization in pregnancy 0008072
Microcephaly
Abnormally small skull
Decreased circumference of cranium
Decreased size of skull
Reduced head circumference
Small head circumference
[ more ]
0000252
Micropenis
Short penis
Small penis
[ more ]
0000054
Midface retrusion
Decreased size of midface
Midface deficiency
Underdevelopment of midface
[ more ]
0011800
Oligohydramnios
Low levels of amniotic fluid
0001562
Polycystic ovaries 0000147
Radioulnar synostosis
Fused forearm bones
0002974
Rocker bottom foot
Rocker bottom feet
Rocker-bottom feet
Rockerbottom feet
[ more ]
0001838
Scoliosis 0002650
Scrotal hypoplasia
Smaller than typical growth of scrotum
0000046
Simple ear 0020206
Single umbilical artery
Only one artery in umbilical cord instead of two
0001195
Small for gestational age
Birth weight less than 10th percentile
Low birth weight
[ more ]
0001518
Stenosis of the external auditory canal
Narrowing of passageway from outer ear to middle ear
0000402
Tarsal synostosis
Fused ankle bones
0008368
Temporal bossing 0032569
Ulnar bowing
Curving of inner forearm bone
0003031
Upper airway obstruction 0002781
Vaginal atresia
Abnormally closed or absent vagina
0000148
Vesicovaginal fistula 0001586
Wide anterior fontanel
Wider-than-typical soft spot of skull
0000260
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Last updated: 7/1/2020

If you need medical advice, you can look for doctors or other healthcare professionals who have experience with this disease. You may find these specialists through advocacy organizations, clinical trials, or articles published in medical journals. You may also want to contact a university or tertiary medical center in your area, because these centers tend to see more complex cases and have the latest technology and treatments.

If you can’t find a specialist in your local area, try contacting national or international specialists. They may be able to refer you to someone they know through conferences or research efforts. Some specialists may be willing to consult with you or your local doctors over the phone or by email if you can't travel to them for care.

You can find more tips in our guide, How to Find a Disease Specialist. We also encourage you to explore the rest of this page to find resources that can help you find specialists.

Healthcare Resources


Related diseases are conditions that have similar signs and symptoms. A health care provider may consider these conditions in the table below when making a diagnosis. Please note that the table may not include all the possible conditions related to this disease.

Conditions with similar signs and symptoms from Orphanet
A similar clinical picture is observed in patients exposed in utero to fluconazole, a lanosterol 14 alpha-demethylase inhibitor.
Visit the Orphanet disease page for more information.

Support and advocacy groups can help you connect with other patients and families, and they can provide valuable services. Many develop patient-centered information and are the driving force behind research for better treatments and possible cures. They can direct you to research, resources, and services. Many organizations also have experts who serve as medical advisors or provide lists of doctors/clinics. Visit the group’s website or contact them to learn about the services they offer. Inclusion on this list is not an endorsement by GARD.

Organizations Supporting this Disease


These resources provide more information about this condition or associated symptoms. The in-depth resources contain medical and scientific language that may be hard to understand. You may want to review these resources with a medical professional.

Where to Start

  • The National Organization for Rare Disorders (NORD) has a report for patients and families about this condition. NORD is a patient advocacy organization for individuals with rare diseases and the organizations that serve them.

In-Depth Information

  • GeneReviews provides current, expert-authored, peer-reviewed, full-text articles describing the application of genetic testing to the diagnosis, management, and genetic counseling of patients with specific inherited conditions.
  • The Monarch Initiative brings together data about this condition from humans and other species to help physicians and biomedical researchers. Monarch’s tools are designed to make it easier to compare the signs and symptoms (phenotypes) of different diseases and discover common features. This initiative is a collaboration between several academic institutions across the world and is funded by the National Institutes of Health. Visit the website to explore the biology of this condition.
  • Online Mendelian Inheritance in Man (OMIM) is a catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 
    Antley-Bixler Syndrome With Genital Anomalies and Disordered Steriodogenesis
    Antley-Bixler Syndrome Without Genital Anomalies and Disordered Steriodogenesis
  • Orphanet is a European reference portal for information on rare diseases and orphan drugs. Access to this database is free of charge.
  • PubMed is a searchable database of medical literature and lists journal articles that discuss Antley Bixler syndrome. Click on the link to view a sample search on this topic.

Questions sent to GARD may be posted here if the information could be helpful to others. We remove all identifying information when posting a question to protect your privacy. If you do not want your question posted, please let us know.


  1. Antley Bixler Syndrome. NORD. 2007; http://rarediseases.org/rare-diseases/antley-bixler-syndrome/.
  2. Boia ES, Popoiu MC, Puiu M, Stanciulescu CM, David VL. Antley-Bixler syndrome: surgical management of ambiguous genitalia - a case report. Med Princ Pract. 2014; 23(4):384-386.
  3. Lahiri S, Ghoshal B, Nandi D. A case of antley-bixler syndrome. J Clin Neonatol. January 2012; 1(1):46-48.