Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Andermann syndrome ?
    ### Response:
    Andermann syndrome (AS) is a disorder that damages the nerves used for muscle movement and sensation (motor and sensory neuropathy). Agenesis or malformation of the corpus callosum also occurs in most people with this disorder. Signs and symptoms of the disorder include areflexia; hypotonia; amyotrophy; severe progressive weakness and loss of sensation in the limbs; and tremors.
    