Type V glycogen storage diseaseMyophosphorylase deficiency; Muscle glycogen phosphorylase deficiency; PYGM deficiency
Type V (five) glycogen storage disease (GSD V) is a rare inherited condition in which the body is not able to break down glycogen. Glycogen is an important source of energy that is stored in all tissues, especially in the muscles and liver.
GSD V is also called McArdle disease.
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