In 1907, Drs. W. W. Keen and C. K. Russell reported series of cases of cervical rib, and reviewed the literature to that date. The condition occurs apparently in the proportion of three females to one male. This may be on account of the fact that deformities of the neck are more apt to be noticed in women than in men. The age at onset of symptoms is usually between 20 and 30, and is frequently determined by some occupation which necessitates the use of the arm. It is occasionally marked by the occurrence of an injury.
Anatomically, these ribs are analogous to the supernumerary floating lumbar ribs, and are often no more than hypertrophies of the transverse processes of the cervical vertebræ. A vestige is always present in the embryo. They are bilateral in 80 per cent, of the cases. They may extend anteriorly to join the sternum or
EVANS ES. CERVICAL RIB. JAMA. 1912;LVIII(15):1111–1112. doi:10.1001/jama.1912.04260040127009
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