Cardiac sarcoidosis is a severe inflammatory disease of the cardiac muscle, manifesting itself as atrioventricular block, ventricular tachycardias, cardiac insufficiency and combinations thereof. Approximately half of cardiac sarcoidosis patients exhibit no clinical signs of sarcoidosis outside the heart. The diagnosis is based on cardiac muscle imaging and myocardial biopsy. High dose corticosteroid medication is utilized for treatment. A life-threatening cardiac event occurred in more than one third of cardiac sarcoidosis patients at Meilahti hospital.