**2. Epidemiology**

Sarcoidosis has a worldwide prevalence of 4.7–64 per 100,000 individuals; the highest rates are found in Northern Europe and among Afro-Americans, predominantly in females [4]. The real prevalence of cardiac sarcoidosis is unknown. In some cases, it can be isolated without extracardiac involvement and in others can have no symptoms; the average age for this disease is 50 [5]. When the clinical behaviors of isolated cardiac sarcoidosis among the group of patients who also register extracardiac compromise are compared, it is found that patients who have the disease confined to the heart exhibit a higher prevalence of complete block of the right branch, delayed myocardial enhancement, and less elevation of the angiotensin-converting enzyme in serum, as they are clinically very similar in their presentation.
