A patient with dermatomyositis (DM) sine myositis has all of the features of dermatomyositis except for the myositis.
Synonym: amyopathic dermatomyositis
Features:
(1) cutaneous findings of dermatomyositis
(2) skin biopsy changes consistent with dermatomyositis
(3) absence of mucle involvement during long-term follow-up.
(4) no other explanation for the findings
Differential diagnosis:
(1) delayed appearance of myositis
(2) dermatomyositis with myositis responsive to therapy but skin changes persistent
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Purpose: To evaluate a patient for evidence of dermatomyositis sine myositis (amyopathic DM).
Specialty: Immunology/Rheumatology
Objective: laboratory tests, differential diagnosis and mimics, red flags
ICD-10: M33.1,
