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INTRODUCTION Child rheumatic mitral stenosis is rare in clinic.Mitral stenosis in children often has a rapid course and is harmful to children.Balloon mitral valvulopasty has yielded good immediate and long-term results in this patients.We report successful percutaneous balloon mitral valvuloplasty (PBMV) in an 8-year-old boy who had severe symptomatic rheumatic mitral stenosis.To our knowledge,the patient is the youngest in China and the second youngest in the world in terms of having undergone the procedure.