CASE REPORTS
JOURNAL ARTICLE
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Juvenile Dermatomyositis Without Skin Lesions in an Antinuclear Matrix Protein 2 Antibody Seropositive Pediatric Case.

We report a 5-year-old boy who presented with progressive weakness in 4 limbs and gait disorders over 7 months. No skin rash was observed on admission. A symmetrical proximodistal weakness was found. The creatine kinase level was normal with a slightly elevated lactate dehydrogenase level. Biopsy specimens showed infiltration of mononuclear cells, few necrotic fibers, and perifascicular atrophy. Screening for myositis-specific antibodies was positive for the antinuclear matrix protein 2 antibody, which is mainly associated with dermatomyositis. Symptoms improved on receiving corticosteroids. Our findings suggest that in cases where inflammatory muscle disease is suspected, antinuclear matrix protein 2 antibody analyses should be considered for precise diagnosis, even with the absence of dermatological symptoms. The case suggests consideration of juvenile dermatomyositis in children with no associated skin manifestations or elevated creatine kinase levels and highlights the importance of screening for myositis-specific antibodies in helping with the diagnosis, given the possible heterogeneity of its clinical presentations.

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