Polyglucosan storage myopathies

The pathogenic mechanisms that cause the abnormal glycogen accumulation appearing as polyglucosan have been studied in some of these diseases. In most cases the pathogenesis is largely unknown. In this review, we summarize the polyglucosan storage diseases from a clinical, morphological, and genetic standpoint. We also identify some important similarities and differences regarding the morphological appearance of polyglucosan accumulation and discuss pathogenic pathways.