Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable frontal chest radiograph demonstrates hypoinflated lungs with bibasilar atelectasis and crowding of vasculature . Interval decrease in interstitial and alveolar markings . Increased small opacity obscuring the left hemidiaphragm . No pleural effusion or pneumothorax . Heart size , mediastinal contour , and hila are unremarkable . Limited assessment of the upper abdomen is within normal limits .
    OUTPUT:
    
1 . Increase in small left lower lobe opacity is most consistent with atelectasis however differential includes pneumonia in the appropriate clinical setting . 2 . Hypoinflated lungs with bibasilar atelectasis . 3 . Interval resolution of vascular congestion .