**5.6 Endomyocardial biopsy**

Being an invasive procedure and considering that sarcoidosis is usually a disease with multisystem compromise, it is preferred to identify a possible extracardiac site for biopsy and histological studies (lymph nodes or lungs). In cases in which the histological tests are not conclusive or there is only cardiac compromise, the endomyocardial biopsy becomes important in the diagnosis of this condition. The diagnostic performance of a blind biopsy is 25% [29] increasing to 50% when guided by images or electroanatomic mapping; this is logical when taking into consideration the multifocal nature of the infiltration [30, 31].
