A case of Mixed Connective Tissue Disease (MCTD) in an 11 years-old girl is reported. This is the first reported in the Department of Child Health, Faculty of Medicine University of Indonesia/Dr. Cipto Mangunkusumo Hospital, Jakarta. In the beginning, the diagnosis was established as scleroderma based on the clinical picture of the skin lesion and the result of the skin biopsy. Laboratory exami…