Cleidocranial dysostosis

• Incomplete or absent collar bone
• Ability to touch shoulders together in front of body
• Loose joints
• Delayed closure of fontanelles
• Tooth abnormalities
  • Failure to lose the primary teeth at the expected time
  • Slow eruption of secondary teeth
  • Extra teeth (supernumerary teeth)
  • Peg teeth
  • Delayed formation or absence of teeth
• Low nasal bridge
• Occipital, parietal, and frontal bossing
• Short forearms
• Short fingers

There is often a family history of cleidocranial dysostosis.

Skeletal x-rays show:

• Undergrowth of the clavicle (collarbone)
• Undergrowth of the scapula (shoulder blade)
• Failure of the pubic symphysis (the place in the front of the pelvis where the bones are united by cartilage) to close

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