Dermatomyositis sine dermatitis, a rare phenotype of idiopathic inflammatory myopathy

Jin Sung Park; Ji Young Park

doi:10.12701/yujm.2017.34.1.137

Case Report Dermatomyositis sine dermatitis, a rare phenotype of idiopathic inflammatory myopathy: Jin Sung Park, Ji Young Park; Journal of Yeungnam Medical Science 2017;34:137.
DOI: https://doi.org/10.12701/yujm.2017.34.1.137
Published online: June 30, 2017

¹Department of Neurology, Kyungpook National University School of Medicine, Daegu, Korea.
²Department of Pathology, Kyungpook National University School of Medicine, Daegu, Korea. neurojspark@gmail.com

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Abstract

Dermatomyositis (DM) is characterized by progressive proximal limb weakness and typical skin manifestations. The histological findings that show perifascicular atrophy and deposition of membrane attack complex are pathognomic features of DM. Dermatomyositis is categorized into classical DM and non-classical DM, which includes amyopathic DM and DM sine dermatitis. DM sine dermatitis is seldom described because of its rarity, making the diagnosis more challenging. We report a case of DM sine dermatitis, a rare phenotype of DM.

Keywords: Dermatomyositis;Sine dermatitis;Skin manifestation;Perifascicular atrophy;Diagnostic criteria

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