Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An endotracheal tube is seen approximately 5 .5 cm above the carina and in appropriate position . A left chest tube is unchanged in position and a right Swan - Ganz catheter is seen terminating in the right ventricular outflow tract . Sternotomy wires are unchanged . The lung volumes are low and again seen is mild pulmonary edema , which appears minimally improved . There are no pleural effusions . The cardiomediastinal silhouette and hilar contours are grossly unchanged . There is no pneumothorax .
    OUTPUT:
    
No evidence of pleural effusion .