A 46-year-old woman underwent pericardiocentesis and pericardial window
for recurrent pericardial effusion. She presented 17 months later with
signs and symptoms consistent with constrictive pericarditis. Cardiac
magnetic resonance imaging revealed an infiltrative mass surrounding the
pericardium. A transcutaneous core needle biopsy of the pericardium
confirmed the diagnosis of pericardial mesothelioma.