Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Bednar tumor ?
    ### Response:
    Bednar tumor is a rare variant of dermatofibrosarcoma protuberans (DFSP), a soft tissue sarcoma that develops in the deep layers of the skin. It accounts for approximately 1% of all DFSP cases. Bednar tumor is also known as pigmented DFSP because it contains dark-colored cells that give may give the tumor a multi-colored (i.
    