Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . The lung volumes are low , limiting evaluation , with subtle opacity increased at the lower lungs likely representing bronchovascular crowding . No large effusion or pneumothorax is seen . There is no evidence of pulmonary edema . The heart is top normal in size . The mediastinal contour is unremarkable . The bony structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
Subtle opacities in lower lungs in the setting of low lung volumes likely reflect bronchovascular crowding and atelectasis . Top normal heart size .