Ambrósio, CMalcata, AB2009-08-312009-08-312009Acta Reumatol Port. 2009 Apr-Jun;34(2):426-430http://hdl.handle.net/10400.4/627Sarcoidosis is a systemic granulomatosis of unknown origin characterized by a formation of non-caseating granulomas in multiple organs, which can present as a chronic, sub acute or an acute form. Löfgren’s syndrome is an acute form of sarcoidosis characterized by the presence of arthritis/arthralgia, eritema nodosum lesions and hilar lymphadenopathy. The authors present 3 case reports of arthritis/ /arthralgia and eritema nodosum lesions in 3 young patients in which the diagnosis was Löfgren’s syndrome. The radiological findings were essencial for the final diagnosis, especially in the presence of a normal value of serum angiotensin-converting enzymeporSarcoidoseArtritejournal article