FKRP and neuromuscular disease caused by qualitative or quantitative defects of alpha-dystroglycan: According to the results of hierarchical clustering (Fig. 1e), 23 (88.46%) of the 26 clustered patients had sarcoglycanopathies or LGMD2I, and 19 (82.61%) of the 23 clustered patients had dystrophinopathies, suggesting that most patients with sarcoglycanopathies or FKRP-associated dystroglycanopathy can be distinguished from dystrophinopathies by muscle MRI at the thigh level according to the presence or absence of the concentric fatty infiltration pattern or trefoil with single fruit sign.