We're presenting a unique case where a 2 month old female presented with URI symptoms at a local clinic and went into cardiac arrest after a nasopharyngeal swab test was done. Subsequent work up revealed she had an intrapericardial mass and a large pericardial effusion, which may have precipitated the arrest. The patient recovered after emergent pericardiocentesis and subsequent pericardial mass excision via sternotomy and pericardiectomy. The infant was recovering appropriately at her 4 month post-op follow up.