RESUMO
Systemic sclerosis (SS) and dermatomyositis (DM) are both multisystem disorders and share some common clinical features. We report here an 11 year-old girl whose disease showed a changing clinical pattern from juvenile systemic sclerosis (JSS) to slowly progressing juvenile dermatomyositis (JDM) and had associated generalized morphea. Serological studies revealed antinuclear antibodies (ANA) with a speckled pattern. Topoisomerase-I (Scl-70), U1 RNP (ribonucleoprotein), anti-Ro, anti-La and anti Jo-1 antibody tests were negative. Electromyography (EMG) was suggestive of primary muscle disease and histopathological findings indicated scleroderma. The patient fulfilled the American College Rheumatology (ACR) diagnostic criteria for JSS as well as Bohan and Peter criteria for JDM separately and hence, was diagnosed to have sclerodermatomyositis (SDM). Mixed connective tissue disease (MCTD) and antisynthetase antibody syndrome (ASS) which share same clinical features with SS and DM were excluded by immunological studies.