malignant pleural effusion diagnosisbiapical pleural parenchymalpleural effusion differentialminimal biapical pleural thickeningbiapical pleural scarringbiapical pleural parenchymal scarringmild biapical pleural thickeningpleural effusion icd 9mild biapical pleural scarringpleural tb diagnosisurinothorax diagnosismanagement pleural effusion
