Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Klippel-Trenaunay Syndrome (KTS) ?
    ### Response:
    Klippel-Trenaunay syndrome (KTS) is a rare congenital malformation involving blood and lymph vessels and abnormal growth of soft and bone tissue. Typical symptoms include hemangiomas (abnormal benign growths on the skin consisting of masses of blood vessels) and varicose veins.
    