Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Streaky retrocardiac opacity may represent atelectasis versus an early pneumonia in the correct clinical setting . Otherwise the lungs are clear . No large effusion is seen . No pneumothorax . No signs of congestion or edema . The heart appears top - normal in size . Mediastinal contour is normal . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Top normal heart size , retrocardiac streaky opacity , likely atelectasis , difficult to exclude an early pneumonia in the correct clinical setting .