Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) adolescent idiopathic scoliosis ?
    ### Response:
    Adolescent idiopathic scoliosis is an abnormal curvature of the spine that appears in late childhood or adolescence. Instead of growing straight, the spine develops a side-to-side curvature, usually in an elongated "S" or "C" shape; the bones of the spine are also slightly twisted or rotated.
    