Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Pectus carinatum ?
    ### Response:
    Pectus carinatum refers to a chest wall abnormality in which the breastbone is pushed outward. It generally presents during childhood and worsens through adolescence. If the condition occurs in isolation, it is often not associated with any additional signs or symptoms.
    