Chronic inflammation of right knee (no other joints are affected).  Recent dry cough, fever nightly, loss of appetite.  Rheumatologist has exhausted all available meds, wants MRI of knee due to large amount of blood in her moved fluid.  General Dr. said cough/fever will go away.  It went away for a week, but has returned.  Loss of appetite for past 5 days.
Do you have any history of injury, I would like to know your age group, and also examine knee joint for effusion, and local warmth, and then decide for knee, as far as your description it could be reactive arthritis?