Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Mondini dysplasia ?
    ### Response:
    What causes Mondini dysplasia? The underlying cause of Mondini dysplasia (MD) in most individuals appears to remain unclear. Some have suggested that retinoids (vitamin A) or other factors a fetus may be exposed to early in pregnancy have contributed to some cases of isolated MD (occurring with no other abnormalities).
    