Answer is D. Diagnosis - Stills Disease.

An 18-year-old man has had fever for several weeks. The fever occurs on an almost daily basis and is associated with an evanescent salmon-colored truncal rash. He has diffuse arthralgias, and an extensive investigation for infections and malignancy is negative. Which of the following is diagnostic of this condition?

a) High-titer rheumatoid factor (RF)
b) Positive ANA
c) Response to steroid therapy
d) Response to nonsteroidal anti- inflammatory drug (NSAID) therapy


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