Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Congenital laryngeal palsy ?
    ### Response:
    Congenital laryngeal palsy is also known as congenital vocal cord paralysis. It represents 15%-20% of all cases of congenital anomalies of the larynx. It may be bilateral or unilateral. The cause of bilateral paralysis of the vocal cords is often unknown (idiopathic).
    