Classification & external resources
Cleidocranial dysostosis or Cleidocranial dysplasia is a hereditary congenital abnormality of humans due to haploinsufficiency caused by mutations in the CBFA1 gene, on  the short arm of chromosome 6.
It has one or more of these features:
- The collarbones are partly or completely missing. If they are completely missing, the shoulders can touch each other in front of the chest.
- The fontanelles of the skull are late in closing, or never close.
- Extra teeth
- Permanent teeth not erupting.
- Bossing (= bulging) of the forehead.
Although he has not said he has the condition, the comedian Emmett Furrow has no collarbones. 
|Congenital malformations and deformations of musculoskeletal system (Q65-Q79, 754-756)|
|Limbs||hip: Dislocation of hip/Hip dysplasia
feet (Club foot, Flat feet, Pes cavus)
head, face, spine and chest: skull, face and jaw (Dolichocephaly, Plagiocephaly) - Scoliosis - chest (Pectus excavatum, Pectus carinatum)
Polydactyly/Syndactyly (Webbed toes)
reduction deficits (Ectrodactyly, Amelia, Phocomelia)
upper limb (Cleidocranial dysostosis, Madelung's deformity, Sprengel's deformity)
knee (Genu valgum, Genu varum)
|Skull and face bones||Craniosynostosis (Scaphocephaly) - Trigonocephaly - Oxycephaly - Crouzon syndrome - Hypertelorism - Macrocephaly - Treacher Collins syndrome - Platybasia|
|Spine and bony thorax||Klippel-Feil syndrome - Spondylolisthesis - Cervical rib - Bifid rib|
|Osteochondrodysplasia||growth of tubular bones and spine: Achondrogenesis - Thanatophoric dysplasia - Short rib-polydactyly syndrome - Chondrodysplasia punctata (Rhizomelic chondrodysplasia punctata, Conradi-Hünermann syndrome), Achondroplasia (Hypochondroplasia, Osteosclerosis congenita) - Ellis-van Creveld syndrome - Spondyloepiphyseal dysplasia congenita|
Osteogenesis imperfecta - McCune-Albright syndrome - Osteopetrosis - Metaphyseal dysplasia - Hereditary multiple exostoses - Osteopoikilosis - Chondrodystrophy - Osteodystrophy
|Other||abdominal wall (Congenital diaphragmatic hernia, Omphalocele, Gastroschisis, Prune belly syndrome) - Ehlers-Danlos syndrome|
|See also non-congenital conditions (M, 710-739)|