Fig. 6From: Masticatory muscle tendon-aponeurosis hyperplasia that was initially misdiagnosed for polymyositis: a case report and review of the literatureHistopathology of the masseter muscle. A H-E staining shows hypertrophic muscle fibers with an increase in their diameters between 20 and 60 μm. B Immunohistochemistry for calcineurin A. Calcineurin A expression is shown in the hypertrophic masseter musclesBack to article page