[Myelogram in systemic juvenile rheumatoid arthritis]

Area of Science:

• Hematology
• Pediatric Rheumatology
• Immunology

Context:

• Systemic onset juvenile rheumatoid arthritis (JRA) is a chronic autoimmune disease affecting children.
• Bone marrow examination provides insights into the hematological manifestations of inflammatory conditions.
• Previous studies suggested hemophagocytosis in JRA bone marrow, necessitating further investigation.

Purpose:

• To evaluate the specific findings in bone marrow smears of children diagnosed with systemic onset JRA.
• To identify characteristic cellular changes and compare them with existing literature on JRA hematopathology.

Summary:

• Retrospective analysis of bone marrow smears from seven pediatric JRA patients.
• Consistent findings included eosinophilia and monocytosis.
• Anemia with erythroid hypoplasia was observed in most cases.
• Increased plasma cells and histiocytes with hemophagocytic activity were noted in a subset of patients.
• Notably, hemophagocytosis was not detected in this study's cohort, contrasting with prior reports.

Impact:

• Provides a detailed hematological profile of bone marrow in systemic JRA.
• Highlights variations in bone marrow findings, particularly the absence of hemophagocytosis in this series.
• Contributes to a better understanding of the bone marrow's role in JRA pathogenesis and diagnosis.