Pectus carinatum is a condition in which the sternum (breastbone) protrudes, or sticks out, more than usual. The causes are unclear, but treatments can correct it.
Pectus carinatum - an overview
Chest deformities
Adult Chest Wall Deformities Clinic University of Maryland School of Medicine
Chest Wall Conditions - Saint John's Cancer Institute
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Chest Wall Disorder: Pectus Carinatum (for Parents)
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Vacuum bell therapy: A nonsurgical option for chest wall depression (pectus excavatum) - Boston Children's Answers
Pectus excavatum Information
Pediatric Pectus and Chest Wall Treatment
Chest Wall Disorder: Pectus Carinatum (for Parents)
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Pectus excavatum: what is it, symptoms and treatment