The medical root word 'pectus' refers to the breast, chest, or
thorax (Latin).
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Pectus is the Latin equivalent of 'chest' in the sense of the body part. Its equivalent in Greek is thorax. Arca is the Latin equivalent of 'chest' in the sense of a box.
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pectus means the pectal area or "chest" as it is commonly
known
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A few patients with Marfan may have a pectus excavatum on one
side of their chest and a pectus carinatum on the other.
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Pectus excavatum is a malformation of the chest in which the
patient's breastbone, or sternum, is sunken inward.