A<unk>  is a congenital abnormality of the<unk>  cage and associated muscles and nerves which occurs in about 1.2% of humans.<unk> s occur in up to 8.4% of Samoans. The sternal end of the<unk>  is cleaved into two. It is usually unilateral.<unk> s are usually asymptomatic, and are often discovered incidentally by chest X-ray. Effects of this neuroskeletal anomaly can include respiratory difficulties, neurological difficulties, limitations, and limited energy from the stress of needing to compensate for the neurophysiological difficulties. An unstable<unk>  may lead to slipping<unk>  syndrome. Another association is with odontogenic keratocysts of the jaw, which may behave aggressively and have a high propensity to recur when treated with simple enucleation and curettage. When seen together, the patient is likely to have nevoid basal-cell carcinoma syndrome (Gorlin-Goltz syndrome).
Bifid rib
Barrel chest
Railway spine
Cervical rib
Midline cervical cleft
Fiddler's neck
Tracheal deviation
Lung hernia