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Cleidocranial dysostosis

Cleidocranial dysostosis
File:Cleidocranial.jpg
Hypoplasia of the clavicles and bell-shaped rib cage in the patient with CDD
Classification and external resources
ICD-10 Q74.0
ICD-9 755.59
OMIM 119600
DiseasesDB 30594
MedlinePlus 001589
NCI Cleidocranial dysostosis
Patient UK Cleidocranial dysostosis
MeSH D002973
GeneReviews

Cleidocranial dysostosis, also called Cleidocranial dysplasia or Mutational dysostosis, is a hereditary congenital disorder, where there is delayed ossification of midline structures.

Etiopathogenesis

It is usually autosomal dominant, but in some cases the cause is not known.[1] It occurs due to haploinsufficiency caused by mutations in the CBFA1 gene (also called Runx2), located on the short arm of chromosome 6, which encodes transcription factor required for osteoblast differentiation.[2]

It results in delayed ossification of midline structures of the body, particularly membranous bone.

Clinical features

Cleidocranial dysostosis is a general skeletal condition[3] 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.[4] Common features are:

Diagnosis

File:Cleidocranial2.jpg
Lateral skull radiograph showing open skull sutures, large fontanelles, multiple wormian bones and underdeveloped paranasal sinuses.

Clinically, different features of the dysostosis are significant. Radiological imaging helps confirm the diagnosis. During gestation (pregnancy), clavicular size can be calculated using available nomograms. Wormian bones can sometimes be observed in the skull.[10]

Treatment

Around 5 years of age, surgical correction may be necessary to prevent any worsening of the deformity.[4] If the mother has dysplasia, caesarian delivery is necessary. Craniofacial surgery may be necessary to correct skull defects [10] Coxa vara is treated by corrective femoral osteotomies. If there is brachial plexus irritation with pain and numbness, excision of the clavicular fragments can be performed to decompress it.[2] In case of open fontanelle, appropriate headgear may be advised by the orthopedist for protection from injury.

Epidemiology

The incidence is estimated at 1:200,000.[10]

Notable cases

The comedian Emmett Furrow has no collarbones and uses the resulting extra shoulder mobility in comedy routines.

At the rescue of Jessica McClure, Ron Short, a muscular man (a roofing contractor) who was born without collarbones because of cleidocranial dysostosis and so could collapse his shoulders to work in cramped corners, arrived at the site and offered to go down the shaft; they accepted his offer, although did not use it.[11][12]

References

  1. ^ Tanaka JL, Ono E, Filho EM, Castilho JC, Moraes LC, Moraes ME (September 2006). "Cleidocranial dysplasia: importance of radiographic images in diagnosis of the condition". J Oral Sci 48 (3): 161–6. PMID 17023750. doi:10.2334/josnusd.48.161. 
  2. ^ a b c d e Turek's Orthopaedics: Principles And Their Application. Lippincott Williams & Wilkins. 2005. pp. 251–252. ISBN 9780781742986. 
  3. ^ Garg RK, Agrawal P (2008). "Clinical spectrum of cleidocranial dysplasia: a case report". Cases J 1 (1): 377. PMC 2614945. PMID 19063717. doi:10.1186/1757-1626-1-377. 
  4. ^ a b Hefti, Fritz (2007). Pediatric Orthopedics in Practice. Springer. p. 478. ISBN 9783540699644. 
  5. ^ a b Juhl, John (1998). Paul and Juhl's essentials of radiologic imaging, 7th ed. Lippincott-Raven. ISBN 9780397584215. 
  6. ^ Greene, Walter (2006). Netter's Orthopaedics, 1st ed. Masson. ISBN 9781929007028. 
  7. ^ Textbook of Radiology and Imaging: Volume 2, 7e. Elsevier Science Health Science Division. 2003. p. 1539. ISBN 9780443071096. 
  8. ^ a b Vanderwerf, Sally (1998). Elsevier's medical terminology for the practicing nurse. Elsevier. p. 65. ISBN 9780444824707. 
  9. ^ Menkes, John (2006). Child Neurology, 7e. Lippincott Williams & Wilkins. p. 307. ISBN 9780781751049. 
  10. ^ a b c Lovell, Wood (2006). Lovell & Winter's Pediatric Orthopaedics, 6e. Lippincott Williams & Wilkins. p. 240. ISBN 9780781753586. 
  11. ^ Kennedy, J. Michael (1987-10-17). "Jessica Makes It to Safety—After 58 1/2 Hours". Los Angeles Times. 
  12. ^ Cleidocranial Dysplasia-An Enigma Among Anomalies

External links