Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Spondylothoracic dysostosis ?
    ### Response:
    Spondylothoracic dysostosis is a rare condition that affects the bones of the spine and the ribs. Signs and symptoms are generally present at birth and may include short-trunk dwarfism (a short body with normal length arms and legs); a small chest cavity; misshapen and abnormally fused vertebrae (bones of the spine); and fused ribs at the part nearest the spine.
    