Clavicle is absent in:
Cleidocranial Dysplasia
(Marie and Sainton’s disease, Scheuthauer-Marie-Sainton syndrome, mutational dysostosis).
A congenital disorder of bone formation manifested with clavicular hypoplasia or agenesis with a narrow thorax, which allows approximation of the shoulders in front of the chest.
Osteogenesis imperfecta
Cleidocranial dysostosis
Fibrous dysplasia
Osteopetrosis