Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Wolffian tumor ?
    ### Response:
    Wolffian tumors are rare tumors located anywhere along the length between the ovary and vagina in sites of remnant wolffian ducts. Wolffian ducts are structures in a developing embryo that get incorporated into the reproductive system in males and degenerate in females.
    