[Arthritis as first symptom of leukemia in children].

Three children out of 30 (10%) referred for juvenile chronic arthritis had leukaemia. The patients had complained of intermittent musculoskeletal pain and painful joint swelling for three weeks, nine months and eighteen months prior to admission. On admission two of the patients had active arthritis with soft tissue swelling in one and three joints respectively. The third patient had only arthralgias and no joint swelling. All patients had slight anaemia, normal to slightly reduced thrombocyte count, slight neutropenia and absence of blasts in the peripheral blood. The correct diagnosis was made by bone marrow aspiration. Two children had acute lymphoblastic leukaemia and the third acute myeloblastic leukaemia. Leukaemia thus remains an important differential diagnosis in children presenting with musculoskeletal pain and/or arthritis.