M12.2: Villonodular synovitis (pigmented)

Villonodular synovitis, also known as pigmented villonodular synovitis, is a rare but noncancerous (benign) condition affecting joints. It specifically targets the lining of the joints (synovium), causing it to swell and overgrow, often leading to excess joint fluid. This condition usually impacts the knee joint, but other joints like the ankle, hip, and shoulder can also be affected. Those affected may experience symptoms including joint pain, swelling, stiffness, and sometimes a decrease in range of motion. Villonodular synovitis tends to progress gradually and its cause remains unknown. However, it has been linked to previous joint trauma. It's important to note that even though it's benign, if left untreated, Villonodular synovitis can potentially lead to joint damage.

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