title: [Exudative pericarditis--its classification and pericardial effusion of unknown etiology].
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010490:Pericardial Effusion / Q000209:etiology*; D010493:Pericarditis / Q000145:classification* / Q000175:diagnosis