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The 11 pages that link to Muscle biopsy, each with the reason it gives.

• ElectromyographyCompared with: Biopsy examines tissue directly when EMG alone cannot establish a muscle diagnosis.

• Mitochondrial diseaseRelated: Muscle tissue can reveal mitochondrial abnormalities when clinical and genetic findings are inconclusive.

• Duchenne muscular dystrophyRelated: It can demonstrate reduced or absent dystrophin when genetic testing does not establish the diagnosis.

• Muscular dystrophyRelated: It can show characteristic protein deficiencies or tissue changes when diagnosis remains uncertain.

• Congenital myopathyRelated: Biopsy can reveal rods, cores, or nuclear positioning that guide classification.

• MyopathyRelated: It can reveal inflammation, degeneration, storage material, or structural abnormalities.

• Polyarteritis nodosaRelated: Sampling symptomatic muscle can detect vasculitis when affected arteries are present.

• Becker muscular dystrophyRelated: Dystrophin staining can help clarify cases when genetic testing is inconclusive.

• DermatomyositisRelated: Biopsy can confirm inflammatory muscle injury when clinical findings and tests leave uncertainty.

• Glycogen storage disease type VRelated: It can demonstrate excess glycogen and absent or reduced muscle phosphorylase activity.

• MyalgiaRelated: It may help identify inflammatory or inherited muscle disease when other tests are inconclusive.