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, and the bones of the spine become slightly twisted or rotated.
    