Cleidocranial dysostosis

Cleidocranial dysostosis
Hypoplasia of the clavicles and bell-shaped rib cage in the patient with CDD
Classification and external resources
Specialty	medical genetics
ICD-10	Q74.0
ICD-9-CM	755.59
OMIM	119600
DiseasesDB	30594
MedlinePlus	001589
MeSH	D002973
GeneReviews	Cleidocranial Dysplasia

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.

A new article reports that the CCD aetiology is thought to be due to a CBFA1 (core binding factor activity 1) gene defect on the short arm of chromosome 6p21 . CBFA1 is vital for differentiation of stem cells into osteoblasts , so any defect in this gene will cause defects in membranous and endochondral bone formation.^[3]

Clinical features

Cleidocranial dysostosis is a general skeletal condition^[4] 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.^[5] Common features are:

Clavicles (collarbones) can be partly missing leaving only the medial part of the bone. In 10% cases, they are completely missing.^[2] 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.^[6] The defect is bilateral 80% of the time.^[7] 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.^[6]
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.
Panoramic view of the jaws showing multiple unerupted supernumerary teeth mimicking premolar, missing gonial angles and underdeveloped maxillary sinuses in cleidocranial dysplasia.
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 supernumarary teeth have been observed. Teeth may also be displaced. Cementum formation may be deficient.^[8]
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 medial fifth phalanges,^[9] sometimes causing short and wide fingers.^[10]
Vertebral abnormalities.^[9]
On rare occasions, brachial plexus irritation can occur.^[2]
Scoliosis, spina bifida and syringomyelia have also been described.^[2]

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 iliac bones, absence of the pubic bone, short / absent fibular bones, short / absent radial bones, hypoplastic terminal phalanges.^[11]

Diagnosis

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.^[12]

Treatment

Around 5 years of age, surgical correction may be necessary to prevent any worsening of the deformity.^[5] If the mother has dysplasia, caesarian delivery is necessary. Craniofacial surgery may be necessary to correct skull defects ^[12] 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.^[12]

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.^[13]^[14]

References

↑ 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. doi:10.2334/josnusd.48.161. PMID 17023750.
1 2 3 4 5 Turek's Orthopaedics: Principles And Their Application. Lippincott Williams & Wilkins. 2005. pp. 251–252. ISBN 9780781742986.
↑ Saraswathivilasam S. Suresh, A Family With Cleidocranial Dysplasia And Crossed Ectopic Kidney In One Child, Acta Orthop. Belg. 2009, N° 4 (Vol. 75/4) p.521-527. http://www.actaorthopaedica.be/acta/article.asp?lang=en&navid=244&id=14667&mod=Acta
↑ Garg RK, Agrawal P (2008). "Clinical spectrum of cleidocranial dysplasia: a case report". Cases J 1 (1): 377. doi:10.1186/1757-1626-1-377. PMC 2614945. PMID 19063717.
1 2 Hefti, Fritz (2007). Pediatric Orthopedics in Practice. Springer. p. 478. ISBN 9783540699644.
1 2 Juhl, John (1998). Paul and Juhl's essentials of radiologic imaging, 7th ed. Lippincott-Raven. ISBN 9780397584215.
↑ Greene, Walter (2006). Netter's Orthopaedics, 1st ed. Masson. ISBN 9781929007028.
↑ Textbook of Radiology and Imaging: Volume 2, 7e. Elsevier Science Health Science Division. 2003. p. 1539. ISBN 9780443071096.
1 2 Vanderwerf, Sally (1998). Elsevier's medical terminology for the practicing nurse. Elsevier. p. 65. ISBN 9780444824707.
↑ Menkes, John (2006). Child Neurology, 7e. Lippincott Williams & Wilkins. p. 307. ISBN 9780781751049.
↑ http://radiopaedia.org/articles/cleidocranial-dysostosis
1 2 3 Lovell, Wood (2006). Lovell & Winter's Pediatric Orthopaedics, 6e. Lippincott Williams & Wilkins. p. 240. ISBN 9780781753586.
↑ Kennedy, J. Michael (1987-10-17). "Jessica Makes It to Safety—After 58 1/2 Hours". Los Angeles Times.
↑ Cleidocranial Dysplasia-An Enigma Among Anomalies

External links

Congenital malformations and deformations of musculoskeletal system / musculoskeletal abnormality (Q65–Q76, 754–756.3)

Appendicular
limb / dysmelia

Arms

clavicle / shoulder:	Cleidocranial dysostosis Sprengel's deformity Wallis–Zieff–Goldblatt syndrome

hand deformity:	Madelung's deformity Clinodactyly Oligodactyly Polydactyly

Leg

hip:	Dislocation of hip / Hip dysplasia Upington disease Coxa valga Coxa vara

knee:	Genu valgum Genu varum Genu recurvatum Discoid meniscus Congenital patellar dislocation Congenital knee dislocation

foot deformity:	varus Club foot Pigeon toe valgus Flat feet Pes cavus Rocker bottom foot Hammer toe

Either / both

fingers and toes	Polydactyly / Syndactyly webbed toes Arachnodactyly Cenani–Lenz syndactylism Ectrodactyly Brachydactyly Clubbed thumb

reduction deficits / limb:	Acheiropodia ectromelia Phocomelia Amelia Hemimelia

multiple joints:	Arthrogryposis Larsen syndrome Rapadilino syndrome

Axial

Skull and face

Craniosynostosis:	Scaphocephaly Oxycephaly Trigonocephaly

Craniofacial dysostosis:	Crouzon syndrome Hypertelorism Hallermann–Streiff syndrome Treacher Collins syndrome

other:	Macrocephaly Platybasia Craniodiaphyseal dysplasia Dolichocephaly Greig cephalopolysyndactyly syndrome Plagiocephaly Saddle nose

Vertebral column

Thoracic skeleton

ribs:	Cervical Bifid

sternum:	Pectus excavatum Pectus carinatum

Genetic disorder, protein biosynthesis: Transcription factor/coregulator deficiencies

(1) Basic domains

1.2	Feingold syndrome Saethre–Chotzen syndrome

1.3	Tietz syndrome

(2) Zinc finger
DNA-binding domains

2.1	(Intracellular receptor): Thyroid hormone resistance Androgen insensitivity syndrome PAIS MAIS CAIS Kennedy's disease PHA1AD pseudohypoaldosteronism Estrogen insensitivity syndrome X-linked adrenal hypoplasia congenita MODY 1 Familial partial lipodystrophy 3 SF1 XY gonadal dysgenesis

2.2	Barakat syndrome Tricho–rhino–phalangeal syndrome

2.3	Greig cephalopolysyndactyly syndrome/Pallister–Hall syndrome Denys–Drash syndrome Duane-radial ray syndrome MODY 7 MRX 89 Townes–Brocks syndrome Acrocallosal syndrome Myotonic dystrophy 2

2.5	Autoimmune polyendocrine syndrome type 1

(3) Helix-turn-helix domains

3.1	ARX Ohtahara syndrome Lissencephaly X2 MNX1 Currarino syndrome HOXD13 SPD1 Synpolydactyly PDX1 MODY 4 LMX1B Nail–patella syndrome MSX1 Tooth and nail syndrome OFC5 PITX2 Axenfeld syndrome 1 POU4F3 DFNA15 POU3F4 DFNX2 ZEB1 Posterior polymorphous corneal dystrophy Fuchs' dystrophy 3 ZEB2 Mowat–Wilson syndrome

3.2	PAX2 Papillorenal syndrome PAX3 Waardenburg syndrome 1&3 PAX4 MODY 9 PAX6 Gillespie syndrome Coloboma of optic nerve PAX8 Congenital hypothyroidism 2 PAX9 STHAG3

3.3	FOXC1 Axenfeld syndrome 3 Iridogoniodysgenesis, dominant type FOXC2 Lymphedema–distichiasis syndrome FOXE1 Bamforth–Lazarus syndrome FOXE3 Anterior segment mesenchymal dysgenesis FOXF1 ACD/MPV FOXI1 Enlarged vestibular aqueduct FOXL2 Premature ovarian failure 3 FOXP3 IPEX

3.5	IRF6 Van der Woude syndrome Popliteal pterygium syndrome

(4) β-Scaffold factors
with minor groove contacts

4.2	Hyperimmunoglobulin E syndrome

4.3	Holt–Oram syndrome Li–Fraumeni syndrome Ulnar–mammary syndrome

4.7	Campomelic dysplasia MODY 3 MODY 5 SF1 SRY XY gonadal dysgenesis Premature ovarian failure 7 SOX10 Waardenburg syndrome 4c Yemenite deaf-blind hypopigmentation syndrome

4.11	Cleidocranial dysostosis

(0) Other transcription factors

0.6	Kabuki syndrome

Ungrouped

Transcription coregulators

Coactivator:	CREBBP Rubinstein–Taybi syndrome

Corepressor:	HR (Atrichia with papular lesions)

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