WHAT IS SPINAL MUSCULAR ATROPHY? SMA is in a class of degenerative motor neuron diseases, such as Muscular Dystrophy (MD), but is the most severe form of such diseases. It is suggested that SMA occurs one in 6000 to one in 20,000 births. SMA affects infants, children and adults worldwide. It is a complex disease … Continue reading Spinal Muscular Atrophy