Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) juvenile Paget disease ?
    ### Response:
    Juvenile Paget disease is a disorder that affects bone growth. This disease causes bones to be abnormally large, misshapen, and easily broken (fractured).  The signs of juvenile Paget disease appear in infancy or early childhood. As bones grow, they become progressively weaker and more deformed.
    