[Update Sarcoidosis].

Sarcoidosis is a systemic granulomatous disease whose etiology has not yet been clarified. Generally, sarcoidosis is a benign disease, but recent studies have shown that the number of chronic progressive diseases is greater than previously thought. Diagnosis is based on the clinical picture and radiological imaging. In recent years, FDG-PET has become more and more important for the determination of activity and, together with MRI of the heart, for the diagnosis of cardiac manifestation. Furthermore, the indication for immunosuppressive treatment must be determined individually for each patient and depends on the severity of the symptoms and organ disorders. In addition to corticosteroids as the first choice, other immunosuppressants such as methotrexate and TNFalpha blockers have been established as stepwise approach.