[Pitfalls in Diagnostic Evaluation of Muscle Diseases].

Diagnostic procedures for muscle diseases provide confirmation of the presence of muscle disorder, and their etiological assessments and precise classification, including the molecular analysis. It is important to understand the correlation between structural changes observed in muscle pathology and functional changes with electrophysiological tests to avoid pitfalls in the diagnostic evaluation of muscle diseases. Here, I present two cases with difficulties in differentiating between inflammatory and hereditary muscle diseases, and discuss pitfalls in the diagnostic process.