Pigmented villonodular synovitis of the knee (PVNS) is a very rare disease. Pigmented villonodular synovitis is most often painless inflammation or swelling, and overgrowth of the lining of a joint.
Pigmented villonodular synovitis of the knee (PVNS) is a very rare disease. Pigmented villonodular synovitis is most often painless inflammation or swelling, and overgrowth of the lining of a joint.