title: [Primary empyema--study of cases].
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D004653:Empyema / Q000601:surgery*; D004654:Empyema, Tuberculous / Q000601:surgery*; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged