Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy with intact appearing wires . The cardiomediastinal silhouette is enlarged but stable in comparison to prior studies . Calcification of the aortic knob is noted . There is no overt pulmonary edema and no focal consolidation concerning for pneumonia . Veil - like opacification of the left lung is compatible with layering pleural effusion , which is difficult to compare to prior upright radiographs . Increased opacification in the right lung base may be related to the diaphragm . A small right pleural effusion is not excluded . There is no pneumothorax . Biapical pleural scarring is again noted .
    OUTPUT:
    
Layering left pleural effusion , which is also seen on ___ but difficult to compare due to differences in patient positioning .