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(anatomy, zoology) The breast, especially of a bird.
Borrowing from Latin.
Pectus excavatum is a malformation of the chest in which the child's breastbone, or sternum, is sunken inward.
Although pectus carinatum does not cause breathing difficulties, it can cause embarassment about appearance.
A few children with Marfan may have a pectus excavatum on one side of their chest and a pectus carinatum on the other.
Pectus excavatum and pectus carinatum can be treated by surgery.
In pectus excavatum, the deformed breastbone and ribs are raised and straightened by a metal bar.
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