Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hypoinflated , resulting in crowding of bronchovascular structures . There is mild central vascular prominence without overt pulmonary edema . Heart is mildly enlarged but unchanged . No pleural effusion or pneumothorax . There is new obscuration of the left heart border , possibly atelectasis , but may reflect pneumonia in the correct clinical setting .
    OUTPUT:
    
New obscuration of the left heart border , possibly atelectasis , but may reflect pneumonia in the correct clinical setting .