Aim: We present the case of a patient aged 68 years who died of chronic heart failure caused by untreated cardiac sarcoidosis (CS). Introduction: Sarcoidosis is a multisystem disorder of unknown etiology, characterized by granulomatous infiltration and the development of noncaseating granulomas in many organ systems. Although the lungs, eyes, and skin are most commonly affected, virtually any body organ can be involved. Clinical evidence of CS is seen only in 5% of patients and the disease may present with tachyarrhythmias, conduction disturbance, heart failure, or sudden cardiac death. Case report: The patient was received in the hospital due to symptoms and signs of global cardiac decompensation with difficulties in the form of dyspnea, orthopnea, and edematous legs. Echocardiographic, cardiac cavities are very dilated with globally reduced systolic function, severe mitral regurgitation and ejection fraction about 20%. Very soon after receiving the patient is died. At autopsy, the heart was dilated, primarily the left ventricle. Histologically, the myocardium was infiltrated by numerous granulomas built of lymphocytes, epitheloid cells, and giant multicellular cells of the Langhans type. As a consequence of severe chronic heart failure, the lungs were edematous with both sides of massive plural effusions. The coronary arteries were non-significantly stenosed. Conclusion: Early diagnosis and treatment can prevent significant morbidity and mortality in patients with CS. It is very important that patients with CS in the early stage of the disease be treated with corticosteroids.