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We report a 12-year-old girl who had pigmented villonodular synovitis with extensive bony erosion around the left sacroiliac joint. The lesion mimicked a primary bone tumor clinically and radiologically, but was a typical pigmented villonodular synovitis (PVNS). The sacroiliac joint is an unusual site for PVNS, especially in the pediatric age group.
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Kang et al. (1992) studied this question.
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