Myotonic dystrophy is a form of muscular dystrophy in which muscles grow weaker over time because they cannot relax normally after they contract. It is the most common form of adult-onset muscular dystrophy and may be the most common overall among the group of disorders referred to as muscular dystrophy.
There are two types of myotonic dystrophy: type 1, which accounts for about 98 percent of all cases, and type 2, which accounts for the other 2 percent. The signs and symptoms of type 2 are often less severe than those of type 1.
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