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Polyarthritis due to Mycobacterium kansasii in a patient with rheumatoid arthritis
Abstract:
A case of destructive polyarthritis due to infection by Mycobacterium kansasii is described in a 68-year-old patient with long-standing rheumatoid arthritis (RA) receiving prednisone and azathioprine therapy. Superimposed infection was suggested by positive Ziehl-Neelsen stains of synovial fluid from the patient's right shoulder and wrists, with confirmation on culture. Histological examination of synovium revealed abundant noncaseating granulomata within subsynovial cellular infiltrates. Treatment with triple antituberculous chemotherapy resulted in substantial extra-articular improvement within 3 months. However, articular destruction progressed unabated. A high index of suspicion is needed to diagnose joint infections in patients with underlying polyarthritis who are receiving immunosuppressive therapy. The progressive joint damage, despite periarticular resolution, may suggest the need for a combination of surgical synovectomy and antituberculous chemotherapy.
Insights
Mycobacterium kansasii infection caused destructive polyarthritis in an immunosuppressed rheumatoid arthritis (RA) patient. Despite chemotherapy, joint damage persisted, highlighting the need for early diagnosis and combined treatment approaches.
Area of Science:
- Rheumatology
- Infectious Diseases
- Immunology
Background:
- Describes a case of destructive polyarthritis in a 68-year-old patient with rheumatoid arthritis (RA).
- The patient was undergoing treatment with prednisone and azathioprine, which are immunosuppressive medications.
- Highlights the challenge of diagnosing superimposed infections in patients with chronic inflammatory conditions on immunosuppression.
Observation:
- Synovial fluid analysis showed positive Ziehl-Neelsen stains and culture for Mycobacterium kansasii.
- Histological examination of the synovium revealed noncaseating granulomata and cellular infiltrates.
- The patient presented with joint effusion and pain in the shoulder and wrists.
Findings:
- Triple antituberculous chemotherapy led to significant improvement in extra-articular symptoms.
- Articular destruction continued despite effective treatment of the infection.
- This suggests that the underlying inflammatory process or the infection's impact on joint structures was not fully resolved by chemotherapy alone.
Implications:
- A high index of suspicion is crucial for diagnosing joint infections in immunosuppressed patients with polyarthritis.
- Progressive joint damage despite infection resolution may indicate the need for combined therapeutic strategies.
- Surgical synovectomy alongside antituberculous chemotherapy could be a potential treatment option for severe cases.