<unk>  is the clinical condition describing synostosis, 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.<unk>  is commonly seen in people with Klippel–Feil syndrome.
Srb's anomaly
Marfanoid
Jordans' anomaly
Aagenaes syndrome
Morgagni Stewart Morel syndrome
Pelger–Huët anomaly
Claude's syndrome
Roberts syndrome