Case Presentation: A 53-year-old female with history of two recent admissions for idiopathic pericarditis presented with several days of increasing chest pain, dyspnea, and lightheadedness. During her first admission three months prior, she underwent urgent pericardiocentesis with pericardial drain placement for early cardiac tamponade. Fluid cytology results were unremarkable. Cardiac computed tomography demonstrated a focal, [...]