Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Primary Familial Brain Calcification ?
    ### Response:
    Primary familial brain calcification (PFBC) is a neurodegenerative disorder characterized by calcium deposits in the basal ganglia, a part of the brain that helps start and control movement. The first symptoms often include clumsiness, fatigue, unsteady walking (gait), slow or slurred speech, difficulty swallowing (dysphagia) and dementia.
    