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Comparison of the parameters in pleural effusion from the three groups. (A) The red blood cell and serum lactate dehydrogenase/pleural fluid adenosine deaminase levels in the malignant pleural effusion (MPE) group were obviously higher than those in the parapneumonic group and the TB group. (B) The pleural fluid CEA level in MPE was markedly higher than those in the parapneumonic group and the TB group
