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A rare case of smear positive tuberculous arthritis
Mathavi Sureshkumar1, Shanmugasundaram Rajamani2, Vijayaragavan Ravindran2, E ArvindhKrishnan1
1 Department of Microbiology, Vinayaka Mission's Kirupananda Variyar Medical College, Vinayaka Missions Research Foundation (Deemed to be University), Salem, Tamil Nadu, India
2 Department of General Medicine, Vinayaka Mission's Kirupananda Variyar Medical College, Vinayaka Missions Research Foundation (Deemed to be University), Salem, Tamil Nadu, India
Correspondence Address:
Mathavi Sureshkumar,
Professor & Head, Department of Microbiology, Vinayaka Mission's Kirupananda Variyar Medical College, Vinayaka Missions Research Foundation (Deemed to be University), Salem - 636 308, Tamil Nadu
India
 Source of Support: None, Conflict of Interest: None DOI: 10.4103/ijpm.ijpm_341_21
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TB arthritis is a very rare extrapulmonary presentation in an immunocompetent host. It is usually the result of direct hematogenous spread from the primary focus. Our patient presented with pain and swelling of the right knee for 6 months. The blood investigations and CT chest revealed findings consistent with active tuberculosis. Synovial fluid was positive for acid-fast bacilli (AFB) which is a very rare finding. Cartridge-based nucleic acid amplification test (CBNAAT) revealed Mycobacterium tuberculosis and sensitivity to rifampicin. Establishing the diagnosis of Mycobacterium tuberculosis beyond doubt is very important, and early initiation of antitubercular treatment (ATT) is important as delay in treatment may lead to irreversible damage to the joint and restriction of joint mobility.
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