Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest film ___ at 08 : 28 is submitted .
    OUTPUT:
    
There is increasing patchy opacity at the right base which likely reflects a layering effusion with associated compressive atelectasis of the lower lobe . A superimposed infection can not be entirely excluded . The left lung is grossly clear with the exception of a linear opacity in the left mid to lower lung which likely reflects subsegmental atelectasis . No pulmonary edema . No pneumothorax . Overall cardiac and mediastinal contours are stable .