Fig. 5From: Muscle biopsy features of idiopathic inflammatory myopathies and differential diagnosisSporadic inclusion body myositis (muscle biopsy, hematoxylin and eosin staining). a, b Rimmed vacuoles and eosinophilic inclusions in the cytoplasm of some muscle fibers. c Fluorescence-enhanced Congo red staining shows amyloid deposit within a vacuole. d (electron microscopy): several filamentous inclusions in the nucleus of muscle fiberBack to article page