Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Congenital diaphragmatic hernia ?
    ### Response:
    Congenital diaphragmatic hernia (CDH) is the lack of development before birth of all or part of the diaphragm, which normally separates the organs in the abdomen from those in the chest cavity. It can range in severity from a thinned area in the diaphragm to its complete absence.
    