A case of primary lung malignancy presenting as pericardial effusion with associated localised Epstein-Barr virus infection or persistence. Editor, Acute pericarditis and pericardial effusion has many causes including infections, malignancy, collagen vascular disease, autoimmune diseases, uraemia, myocardial infarction, trauma, surgery, medications and hypothyroidism.We report a rare case in wh...