Pericardial diseases are a heterogeneous group of entities, ranging from acute pericarditis (AP) to asymptomatic pericardial effusions. Diagnosis of AP can be made when two of the following criteria are present: chest pain (85–90% of cases), typically sharp and pleuritic, improved by sitting up and leaning forward, pericardial friction rub (present in less than 33% of cases), electrocardiogram changes (up to 60% of cases), with new widespread ST elevation or PR depression in the acute phase and pericardial effusion (up to 60% of cases, generally mild) [1].