Fever of unknown origin is a symptom that is recognized in all medical branches. Even though fever is a symptom of infectious diseases, not all fever cases are related with infectious diseases. In the event of long term fever, beside the infectious diseases, collagen tissue lesions and malignancies must also be recognized.1 Here, we present two adult-onset Still disease patients who were diagnosed with fever of unknown origin. Our aim is to point out the importance of remembering adult-onset Still disease in patients who were diagnosed with fever of unknown origin.
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