Dermatomyositis causes inflammation and damage of muscle and skin, and sometimes involves internal organs, especially lung parenchyma. Patients with dermatomyositis still represent a diagnostic challenge because of the rarity of this disease and the lack of specificity of some of its cutaneous manifestations. Herein, we describe the case of a patient with dermatomyositis, initially diagnosed as psoriatic arthritis, in which the performance of anti-melanoma differentiation-associated gene 5 (MDA5) antibodies was decisive to establish a definitive diagnosis.
Keywords: Artritis psoriásica; Dermatomiositis; Dermatomyositis; Melanoma differentiation-associated protein gene 5; Proteína asociada a la diferenciación del melanoma 5; Psoriatic arthritis.
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