Adult Onset Still’s Disease: A rare diagnosis of undetermined febrile syndrome.

Adult Onset Still’s Disease (AOSD) is a rare, systemic inflammatory disease. Its main manifestations consist of fever, arthralgias and evanescent rash and the diagnosis is essentially clinical. The authors present a case of a 43-year-old woman admitted to the Emergency Department because of fever, odynophagia and arthralgia for about 2 weeks. Complementary diagnostic tests showed elevation of C-Reactive Protein (CRP) and leukocytosis. After exhaustive investigation, the diagnosis of AOSD was made. The authors intend to alert to the importance of the inclusion of this pathology in the differential diagnosis of undetermined febrile syndrom