Coexistence of sarcoidosis and adult onset Still disease.

Sarcoidosis is a chronic, inflammatory disease with unknown cause characterized by non-caseating granuloma formations. It can be presented with bilateral hilar lymphadenopathy, skin lesions, eye involvement and locomotor system findings. Adult onset Still disease (AOSD) is a chronic inflammatory disease which presents with fever, arthritis and typical skin rashes. The disease is rare and can be misdiagnosed due to the absence of typical clinical and laboratory findings. The association of sarcoidosis and AOSD has not been previously reported in the literature. Herein we reported the development of AOSD in a patient followed by the diagnosis of sarcoidosis. The patient did not respond to high-dose corticosteroids and methotrexate therapy, and the disease was under control with anti-IL-6 (Tocilizumab) drug.