Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) mucopolysaccharidosis type VII ?
    ### Response:
    Mucopolysaccharidosis type VII (MPS VII), also known as Sly syndrome, is a progressive condition that affects most tissues and organs. The severity of MPS VII varies widely among affected individuals.  The most severe cases of MPS VII are characterized by hydrops fetalis, a condition in which excess fluid builds up in the body before birth.
    