Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) familial idiopathic basal ganglia calcification ?
    ### Response:
    Familial idiopathic basal ganglia calcification (FIBGC, formerly known as Fahr disease) is a condition characterized by abnormal deposits of calcium (calcification) in the brain. These calcium deposits typically occur in the basal ganglia, which are structures deep within the brain that help start and control movement; however, other brain regions can also be affected.
    