Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographdemonstrates mild bilateral lower lobe heterogeneous opacities , left greater than right . No pleural effusion or pneumothorax . Heart size , mediastinal contour , and hila are unremarkable . Limited assessment of the upper abdomen is within normal limits .
    OUTPUT:
    
Mild bilateral lower lobe heterogeneous opacities , left greater than right , is most suggestive of atelectasis however superimposed infection can not be excluded .