Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Baller-Gerold syndrome ?
    ### Response:
    Baller-Gerold syndrome is a rare condition characterized by the premature fusion of certain skull bones (craniosynostosis) and abnormalities of bones in the arms and hands.  People with Baller-Gerold syndrome have prematurely fused skull bones, most often along the coronal suture, the growth line that goes over the head from ear to ear.
    