Mouth showing many over-retained deciduous teeth and some missing teeth.<unk>  is a general skeletal condition so named from the collarbone (cleido-) and cranium deformities which people with it often have. People with the condition usually present with a painless swelling in the area of the clavicles at 2–3 years of age. Common features are: * Clavicles (collarbones) can be partly missing leaving only the medial part of the bone. In 10% of cases, they are completely missing. If the collarbones are completely missing or reduced to small vestiges, this allows hypermobility of the shoulders including ability to touch the shoulders together in front of the chest. The defect is bilateral 80% of the time. Partial collarbones may cause nerve damage symptoms and therefore have to be removed by surgery. * The mandible is prognathic due to hypoplasia of maxilla (micrognathism) and other facial bones. * A soft spot or larger soft area in the top of the head where the fontanelle failed to close, or the fontanelle closes late. * Bones and joints are underdeveloped. People are shorter and their frames are smaller than their siblings who do not have the condition. * The permanent teeth include supernumerary teeth. Unless these supernumeraries are removed they will crowd the adult teeth in what already may be an underdeveloped jaw. If so, the supernumeraries will probably need to be removed to make space for the adult teeth. Up to 13 supernumerary teeth have been observed. Teeth may also be displaced. Cementum formation may be deficient. * Failure of eruption of permanent teeth. * Bossing (bulging) of the forehead. * Open skull sutures, large fontanelles. * Hypertelorism. * Delayed ossification of bones forming symphysis pubis, producing a widened symphysis. * Coxa vara can occur, limiting abduction and causing Trendelenburg gait. * Short middle fifth phalanges, sometimes causing short and wide fingers. * Vertebral abnormalities. * On rare occasions, brachial plexus irritation can occur. * Scoliosis, spina bifida and syringomyelia have also been described. Other features are: parietal bossing, basilar invagination (atlantoaxial impaction), persistent metopic suture, abnormal ear structures with hearing loss, supernumerary ribs, hemivertebrae with spondylosis, small and high scapulae, hypoplasia of illiac bones, absence of the pubic bone, short / absent fibular bones, short / absent radial bones, hypoplastic terminal phalanges.
Cleidocranial dysostosis
Osteogenesis imperfecta
Acrofrontofacionasal dysostosis
Pycnodysostosis
Nager acrofacial dysostosis
Hajdu–Cheney syndrome
Ghosal hematodiaphyseal dysplasia
Mandibuloacral dysplasia