"some authors suggest a depth of less than 30 mm being an additional supportive feature more suggestive of a parapneumonic effusion verses an empyema when other factors are also taken into account 6."
"empyema: , ~7.5-10 % of patients with parapneumonic effusions progress to a fibrinopurulent stage such as empyema 3-4"
Expected headings
"Plain radiograph / CT"
"Complications"