Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Inflammatory myofibroblastic tumor ?
    ### Response:
    What causes inflammatory myofibroblastic tumors? The underlying cause of inflammatory myofibroblastic tumors (IMTs) remains unknown. While some researchers believe it is a true neoplasm, others believe that it represents an immunologic response to an infectious or noninfectious agent.
    