Chicken breast

Also pigeon chest. A deformity in infants in which the chest protrudes at the center, giving it the appearance of a chicken’s breast; hence the name. This condition is attributed to congenital insufficiency and/or poor nourishment after birth and manifests as spleen-kidney depletion and softness of the bones.

Biomedical correspondence: pectus carinatum (pectus gallinatum).