Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Pigmented villonodular synovitis ?
    ### Response:
    How is pigmented villonodular synovitis diagnosed? Pigmented villonodular synovitis (PVNS) is diagnosed via physician examination, imaging studies, and sometimes surgical procedures. Imaging studies commonly used include: X-ray, MRI, and CT scan. MRI findings are diagnostic in more than 95% of patients.
    