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16.A 4 year old female has been limping with swelling of her right knee for several months. Physical examination demonstrates swelling of her right knee, flexion contracture of 10 degrees and flexion to 120 degrees. Lab. data: WBC 8 g/l, with 45\% neutr., 47 lymphs\%, 8\% mon. Hgb 120 g/l. ESR 20mm/h. Rheum. factor neg., ANA 1:640 speckled. ................
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