Srb's anomaly is the clinical condition describing

synostosis Synostosis (plural: synostoses) is fusion of two or more bones. It can be normal in puberty, fusion of the epiphyseal plate to become the epiphyseal line, or abnormal. When synostosis is abnormal it is a type of dysostosis. Examples of synostoses ...

, or fusion, between the first and second ribs. It may be either a partial or complete fusion between the two ribs to create an entirely indistinguishable new rib. Srb's anomaly is commonly seen in people with

Klippel–Feil syndrome Klippel–Feil syndrome (KFS), also known as cervical vertebral fusion syndrome, is a rare congenital condition characterized by the abnormal fusion of any two of the seven bones in the neck (cervical vertebrae). It results in a limited ability ...

References

Syndromes {{congenital-malformation-stub