Glycogen storage diseases (GSDs) are a group of metabolic disorders that result from defects in either making glycogen or breaking down glycogen into glucose for use as an energy source. These defects generally result in a buildup of abnormal or normal glycogen in the liver and muscles (Glycogen storage disease type 0 results from an inability to make glycogen which results in decreases in glycogen levels in the liver and is apparently not considered a true GSD despite the name . . .). Liver issues are the most common result but other tissues can also be affected, including skeletal muscle, the cardiovascular system, kidneys and nervous tissue.
Please see the general information links or search OMIM for "glycogen storage disease" for more information.
General information links for Glycogen storage diseases: