Juvenile Dermatomyositis Presenting As Generalized Poikiloderma: A Case Report

Area of Science:

• Pediatrics
• Dermatology
• Rheumatology

Background:

• Juvenile dermatomyositis (JDM) is an idiopathic inflammatory myopathy primarily affecting skin and muscles.
• Typical JDM symptoms include Gottron papules, heliotrope rash, and proximal muscle weakness.
• Generalized scaly poikiloderma is an uncommon initial presentation of JDM.

Observation:

• A 14-month-old female initially presented with asymptomatic, generalized, progressive, scaly, mottled, violaceous patches (poikilodermatous).
• Initial diagnosis was poikilodermatous skin rash, with differentials including amyopathic dermatomyositis and genodermatosis.
• The patient's condition evolved over a year, showing widespread poikiloderma, dysphagia, and motor deficits.

Findings:

• Laboratory results revealed leukopenia, anemia, elevated muscle enzymes (CPK, LDH), ferritin, CRP, and ESR.
• MRI demonstrated subcutaneous edema in the thigh musculature.
• The patient was diagnosed with JDM based on the full clinical picture and investigations.

Implications:

• This case highlights the importance of considering JDM in children with unusual poikilodermatous skin manifestations.
• Delayed diagnosis of JDM can lead to significant morbidity, including muscle damage and functional impairment.
• Recognizing rare presentations of JDM is vital for prompt initiation of appropriate management and improved patient outcomes.