Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest ___ at 09 :40 are submitted
    OUTPUT:
    
Interval appearance of layering moderate to large right - sided pleural effusion with adjacent airspace opacity which could reflect atelectasis , although pneumonia or even a mass can not be excluded . The remaining lungs are clear with no evidence of pulmonary edema . No left - sided effusion is seen . Overall cardiac and mediastinal contours are difficult to assess due to the size of the right pleural collection . No pneumothorax .