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

Atelosteogenesis type 2



Other Names:
AOII; AO2; Neonatal osseous dysplasia 1; AOII; AO2; Neonatal osseous dysplasia 1; De la Chapelle dysplasia; Atelosteogenesis II See More
Categories:

Atelosteogenesis type 2 is a genetic disorder that affects cartilage and bone development. Infants born with this condition have very short arms and legs, a narrow chest, and a prominent, rounded abdomen. The signs and symptoms of atelosteogenesis type 2 include an opening in the roof of the mouth (a cleft palate), characteristic facial features, an inward- and upward-turning foot (clubfoot), and unusually positioned thumbs (hitchhiker thumbs). Atelosteogenesis type 2 causes serious health problems and infants with this disorder are usually stillborn or die soon after birth from respiratory failure. Some infants, however, have lived for a short time with intensive medical support.[1]
Last updated: 12/17/2013

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.

Showing of 71 |
Medical Terms Other Names
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HPO ID
30%-79% of people have these symptoms
Abnormal facial shape
Unusual facial appearance
0001999
Bell-shaped thorax 0001591
Bilateral talipes equinovarus
Club foot on both sides
0001776
Brachydactyly
Short fingers or toes
0001156
Broad metacarpals
Wide long bones of hand
0001230
Broad phalanx
Wide digital bones
0006009
Camptodactyly
Permanent flexion of the finger or toe
0012385
Dumbbell-shaped femur
Dumbbell-shaped thighbone
0006375
Equinovarus deformity 0008110
Excessive femoral anteversion 0012427
Genu valgum
Knock knees
0002857
Hitchhiker thumb 0001234
Laryngeal cartilage malformation 0008752
Laryngeal stenosis 0001602
Metatarsus adductus
Front half of foot turns inward
0001840
Narrow chest
Low chest circumference
Narrow shoulders
[ more ]
0000774
Pulmonary hypoplasia
Small lung
Underdeveloped lung
[ more ]
0002089
Rhizomelic arm shortening 0004991
Sandal gap
Gap between 1st and 2nd toes
Gap between first and second toe
Increased space between first and second toes
Sandal gap between first and second toes
Wide space between 1st, 2nd toes
Wide space between first and second toes
Wide-spaced big toe
Widely spaced 1st-2nd toes
Widely spaced first and second toes
Widened gap 1st-2nd toes
Widened gap first and second toe
[ more ]
0001852
Short femur
Short thighbone
0003097
Short lower limbs
Short legs
0006385
Short metacarpal
Shortened long bone of hand
0010049
Short neck
Decreased length of neck
0000470
Short phalanx of finger
Short finger bones
0009803
Short ribs 0000773
Thoracolumbar kyphoscoliosis 0003423
Tibial torsion 0100694
Tracheobronchomalacia 0002786
Ulnar deviation of the hand or of fingers of the hand 0001193
Upper limb undergrowth
Short arms
Shortening of the arms
[ more ]
0009824
5%-29% of people have these symptoms
Bilateral cleft palate
Right and left cleft palate
0100337
Cervical kyphosis
Rounded neck
0002947
Elbow flexion contracture
Contractures of elbows
Elbow contracture
Elbow contractures
[ more ]
0002987
Epicanthus
Eye folds
Prominent eye folds
[ more ]
0000286
Facial midline hemangioma 0004664
Hypertelorism
Wide-set eyes
Widely spaced eyes
[ more ]
0000316
Hypoplastic cervical vertebrae 0008434
Long philtrum 0000343
Low-set ears
Low set ears
Lowset ears
[ more ]
0000369
Micrognathia
Little lower jaw
Small jaw
Small lower jaw
[ more ]
0000347
Micromelia
Smaller or shorter than typical limbs
0002983
Midface retrusion
Decreased size of midface
Midface deficiency
Underdevelopment of midface
[ more ]
0011800
Plagiocephaly
Flat head syndrome
Flattening of skull
Rhomboid shaped skull
[ more ]
0001357
Polyhydramnios
High levels of amniotic fluid
0001561
Protuberant abdomen
Belly sticks out
Extended belly
[ more ]
0001538
Telecanthus
Corners of eye widely separated
0000506
Thin upper lip vermilion
Thin upper lip
0000219
Wide nasal base
Broad base of nose
Broad nasal base
Increased width of base of nose
Increased width of nasal base
Wide base of nose
[ more ]
0012810
1%-4% of people have these symptoms
Death in infancy
Infantile death
Lethal in infancy
[ more ]
0001522
Elbow dislocation
Dislocations of the elbows
Elbow dislocations
[ more ]
0003042
Increased intervertebral space 0030320
Stillbirth
Stillborn
0003826
Percent of people who have these symptoms is not available through HPO
Abnormality of pelvic girdle bone morphology
Abnormal shape of pelvic girdle bone
0002644
Autosomal recessive inheritance 0000007
Bifid humerus
Notched long bone in upper arm
0003864
Cleft palate
Cleft roof of mouth
0000175
Coronal cleft vertebrae 0003417
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
Flat acetabular roof 0003180
Horizontal sacrum 0003440
Lacunar halos around chondrocytes 0032930
Limb undergrowth
limb shortening
Short limb
Short limbs
[ more ]
0009826
Lumbar hyperlordosis
Excessive inward curvature of lower spine
0002938
Malar flattening
Zygomatic flattening
0000272
Platyspondyly
Flattened vertebrae
0000926
Respiratory insufficiency
Respiratory impairment
0002093
Scoliosis 0002650
Short greater sciatic notch 0003185
Short middle phalanx of finger
Short middle bone of finger
0005819
Talipes equinovarus
Club feet
Club foot
Clubfeet
Clubfoot
[ more ]
0001762
Thoracic hypoplasia
Small chest
Small thorax
[ more ]
0005257
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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


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

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. 
  • 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 Atelosteogenesis type 2. Click on the link to view a sample search on this topic.

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  • Can you please help me get information on atelosteogenesis type 2? I have just found out that I have this. See answer



  1. Genetics Home Reference. Atelosteogenesis type 2. http://ghr.nlm.nih.gov/condition/atelosteogenesis-type-2. Accessed 12/17/2013.