Cervical ribs are anomalous, supernumerary, extra, or additional ribs which usually arise from the seventh cervical vertebra. A cervical rib can also originate from the sixth or the fifth cervical vertebrae or, very rarely, from the fourth cervical vertebra. Radiographic images indicate that the prevalence of cervical ribs is below 1% in the general population. However, studies have found its occurrence to vary from 0.58% to 6.2%, depending on the population. Cervical ribs are often bilateral.
This is a companion discussion topic for the original article at https://patient.info/doctor/cervical-ribs-and-thoracic-outlet-syndrome