Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Mild basal opacity may represent atelectasis given associated volume loss , though can not exclude an early pneumonia . Cardiomegaly is mild . No large effusions or pneumothorax . Bony structures are intact .
    OUTPUT:
    
Mild basal opacity likely atelectasis , less likely pneumonia . Mild cardiomegaly .