Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Accessory navicular bone ?
    ### Response:
    What are the signs and symptoms of Accessory navicular bone? Accessory navicular bone may cause no symptoms, but in some cases causes pain, tenderness, or irritation on or around the top of the instep. It may also cause the foot to be abnormally positioned, and may limit the normal motion of the foot.
    