Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Dandy-Walker malformation ?
    ### Response:
    Dandy-Walker malformation affects brain development, primarily development of the cerebellum, which is the part of the brain that coordinates movement. In individuals with this condition, various parts of the cerebellum develop abnormally, resulting in malformations that can be observed with medical imaging.
    