Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) caudal regression syndrome ?
    ### Response:
    Caudal regression syndrome is a disorder that impairs the development of the lower (caudal) half of the body. Affected areas can include the lower back and limbs, the genitourinary tract, and the gastrointestinal tract.  In this disorder, the bones of the lower spine (vertebrae) are frequently misshapen or missing, and the corresponding sections of the spinal cord are also irregular or missing.
    