Mitochondrial myopathy revealed postoperative acute respiratory failure: A case report

Figure 1 Microscopic findings of the biceps bracii muscle. A: Moderate variation in myofiber size and many degenerating and regenerating myofibers are shown. Circular/Spherical atrophic myofibers are frequently observed (hematoxylin and eosin, × 100); B: On modified Gomori-trichrome stain, ragged red fibers with increased subsarcolemmal and intermyofibrillar red staining are frequently seen (modified Gomori-trichrome, × 200). (Inlet) On succinate dehydrogenase (SDH) staining, strong positivity is present in many myofibers (SDH, × 200); C: Subsarcolemmal accumulation of swollen mitochondria is frequently noted in electron microscope (EM) (EM, × 2000); D: Many abnormally enlarged mitochondria are noted (EM, × 30000).