Primary Endpoint * To assess the prevalence and diagnostic performance of pre-determined echographic features in predicting the diagnosis of TBE from MPE. * To determine the clinical, pleural fluid and echographic parameters that were different among TBE and MPE and to establish a clinical prediction model for TBE. Secondary Endpoint * To assess the correlation between pleural fluid parameters with ultrasound and medical thoracoscopic finding. * To assess the optimal Pf ADA cut-off value to differentiate TBE from MPE in our region.
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Transthoracic ultrasound
Timeframe: 12 months