Cervical rib
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215839347
2008-05-29T22:46:36Z
67.167.221.105
/* Associated conditions */
{{Infobox_Disease |
Name = Cervical rib |
Image = Halsrippe.png|
Caption = |
DiseasesDB = 2317 |
ICD10 = {{ICD10|Q|76|5|q|65}} |
ICD9 = {{ICD9|756.2}} |
ICDO = |
OMIM = 117900 |
MedlinePlus = |
eMedicineSubj = |
eMedicineTopic = |
MeshID = |
}}
A '''cervical rib''' is a [[supernumerary body part|supernumerary]] (or extra) [[rib]] which arises from the seventh [[cervical vertebra]]. It is a [[congenital]] abnormality located above the normal first rib. A cervical rib is present in only about 1 in 200 (0.5%) of people; in even rarer cases, an individual may have not one but two cervical ribs.
==Associated conditions==
The presence of a cervical rib can cause a form of [[thoracic outlet syndrome]] due to compression of the lower trunk of the [[brachial plexus]] or [[subclavian artery]]. These structures are entrapped between the cervical rib and scalenus muscle.
Compression of the brachial plexus may be identified by weakness of the muscles around the muscles in the hand, near the base of the thumb. Compression of the subclavian artery is often diagnosed by finding a positive [[Adson's sign]] on examination, where the radial [[pulse]] in the arm is lost during abduction and external rotation of the shoulder.
Children born with cervical ribs develop early childhood cancer at a rate 125 times higher than the general population. The ''Hox'' genes that control the development of cervical vertebrae are believed to play a role in suppressing cancer.<ref name="hox_cancer">{{cite web |title=Vertebral variation, Hox genes, development, and cancer |url=http://scienceblogs.com/pharyngula/2006/01/vertebral_variation_hox_genes.php |author=Myers, PZ |accessdate=2008-04-16 }}</ref>
==Anatomy Diagrams==
* [http://www.backpain-guide.com/Chapter_Fig_folders/Ch08_Congen_Folder/Ch08_Images/08-7_Vert_NumbAbn.jpg Detailed diagrams of a cervical rib]
==Notes==
<references />
{{Congenital malformations and deformations of musculoskeletal system}}
[[Category:Supernumerary body parts]]
{{med-stub}}
[[de:Halsrippensyndrom]]
[[pl:Zespół żebra szyjnego]]