Conclusion:
This case reminds us to have thorough attentive investigations for constrictive pericarditis so that less probable etiologies are not missed, optimal treatment is delivered, and serious adverse events are prevented. It is of great consideration to execute a rigorous investigation for autoimmune etiologies even when there is no prior history. In cases of acute pericarditis, constrictive pathophysiology must always be kept in mind so that inappropriate pericardiocentesis is prevented.