Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Pantothenate kinase-associated neurodegeneration ?
    ### Response:
    What are the signs and symptoms of Pantothenate kinase-associated neurodegeneration? There are two forms of PKAN, classical and atypical. Symptoms of classic PKAN develop during early childhood, usually before age 10. The first symptom is often difficutly with movement and walking.
    