Breast calcinosis in a patient with Dermatomyositis.

A 71-year-old woman presented with a pruritic macular rash on her chest that progressed to involve the limbs, face, and scalp. In addition, the rash was associated with progressive proximal muscle weakness that was symmetrically distributed, dysphagia, and fatigue over the past 6 months. A skin examination revealed Gottron’s and shawl signs. She underwent a skin biopsy that revealed perivascular lymphocytic infiltration and interface dermatitis. This was consistent with the diagnostic findings of dermatomyositis (DM). Moreover, electromyography was consistent with a myopathic pattern, and the muscle biopsy revealed a well-defined perifascicular distribution of muscle fiber injury with sparse collections of inflammatory cells predominantly surrounding the perimysial vessels and muscle fibers. These characteristics were diagnostic of DM (1).