Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Bilateral frontal polymicrogyria ?
    ### Response:
    Bilateral frontal polymicrogyria is one of the rarest subtypes of polymicrogyria. It is a symmetric and bilateral form (in both brain hemispheres) that only involves the frontal lobes without including the area located behind the Sylvius fissure or the area located behind the Rolando sulcus.
    