Monomelic amyotrophy (also known as MMA, Hirayama's disease, Sobue diease or Juvenile nonprogressive amyotrophy) is an untreatable, focal, lower motor neuron disease that primarily affects young (15 - 25 year-old) males in India and Japan. MMA is marked by insidious onset of muscular atrophy, which stabilizes at a plateau after two to five years from which it neither improves nor worsens. There is no pain or sensory loss associated with MMA. Unlike other lower motor neuron diseases, MMA is not believed to be hereditary and fasciculations (involuntary muscle twitches) are rare...