Mycobacterium intracellulare-Induced Flexor Tenosynovitis of the Forearm.

We herein document a clinically challenging case of Mycobacterium intracellulare tenosynovitis in an immunocompromised patient with rheumatoid arthritis. Diagnosing nontuberculous mycobacterial tenosynovitis is often challenging because it often mimics rheumatoid arthritis flares. Combination antimycobacterial therapy combined with surgical intervention is essential for the treatment of this refractory condition.