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Cervical rib

**Cervical rib**
*Classification & external resources*
ICD-10	Q76.5
ICD-9	756.2
OMIM	117900
DiseasesDB	2317

A cervical rib is a supernumerary (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.

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Associated conditions

The presence of a cervical rib can cause a form of thoracic outlet syndrome due to compression of the brachial plexus or subclavian artery. 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.

Anatomy Diagrams

Detailed diagrams of a cervical rib

v • d • e Congenital malformations and deformations of musculoskeletal system (Q65-Q79, 754-756)
Limbs	hip: Dislocation of hip/Hip dysplasia feet (Club foot, Flat feet, Pes cavus) head, face, spine and chest: skull, face and jaw (Dolichocephaly, Plagiocephaly) - Scoliosis - chest (Pectus excavatum, Pectus carinatum) Polydactyly/Syndactyly (Webbed toes) reduction deficits (Ectrodactyly, Amelia, Phocomelia) upper limb (Cleidocranial dysostosis, Madelung's deformity, Sprengel's deformity) knee (Genu valgum, Genu varum) Arthrogryposis
Skull and face bones	Craniosynostosis (Scaphocephaly) - Trigonocephaly - Oxycephaly - Crouzon syndrome - Hypertelorism - Macrocephaly - Treacher Collins syndrome - Platybasia
Spine and bony thorax	Klippel-Feil syndrome - Spondylolisthesis - Cervical rib - Bifid rib
Osteochondrodysplasia	growth of tubular bones and spine: Achondrogenesis - Thanatophoric dysplasia - Short rib-polydactyly syndrome - Chondrodysplasia punctata (Rhizomelic chondrodysplasia punctata, Conradi-Hünermann syndrome), Achondroplasia (Hypochondroplasia, Osteosclerosis congenita) - Ellis-van Creveld syndrome - Spondyloepiphyseal dysplasia congenita Osteogenesis imperfecta - McCune-Albright syndrome - Osteopetrosis - Metaphyseal dysplasia - Hereditary multiple exostoses - Osteopoikilosis - Chondrodystrophy - Osteodystrophy
Other	abdominal wall (Congenital diaphragmatic hernia, Omphalocele, Gastroschisis, Prune belly syndrome) - Ehlers-Danlos syndrome
See also non-congenital conditions (M, 710-739)