Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . The heart size appears within normal limits . No configurational abnormality is seen . Thoracic aorta and mediastinal structures are unremarkable . The pulmonary vasculature is not congested . The right hemithorax is unremarkable . On the left , there is evidence of pleural effusion blunting the lateral pleural sinus and obliterating the diaphragmatic contours . The density continues along the lateral chest wall and reaches the apical portion in the form of a minor 2 mm wide density . As there is no evidence of any air - fluid level in the pleural space at any level , a new pneumothorax can be excluded . The accessible pulmonary vasculature does not show any congestive pattern and no new acute infiltrates are seen . Parenchyma of left lower lobe can not be assessed as it is obscured by the pleural density . The next preceding torso CT of the preceding day ( ___ ) is reviewed , so to compare via at that time existing pleural density with today 's finding . Paying attention to the different patient position between the two studies , precise detail estimate of fluid difference in the pleural space difficult , but a rough estimate of pleural effusion amount on the CT , compared to today 's finding is compatible with the reported 550 mL thoracocentesis of pleural effusion . Although the CT examination does not give any conclusive evidence for any parenchymal abnormality in the left lower lobe , the CT demonstrated status post right - sided nephrectomy and central liver mass as noted during review of the scan .
    OUTPUT:
    
Reduction of left - sided pleural effusion , but still moderate degree of remaining pleural effusion estimated to another 500 mL remaining .