Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographdemonstrates hypoinflated lungs with crowding of vasculature and bilateral lower lobe atelectasis . Heterogeneous opacity partially obscuring the right heart border is seen on this slightly rotated film . No pleural effusion or pneumothorax . Heart size , mediastinal contour , and hila are unremarkable . Limited assessment of the upper abdomen is within normal limits .
    OUTPUT:
    
Opacity partially obscuring right heart border is most consistent with atelectasis however differential includes pneumonia in the appropriate clinical setting .