Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is an infrahilar opacity partly obscuring the left cardiac border suggesting opacities in the lingula and left lower lobe probably due to atelectasis . Otherwise , the lungs appear clear . There are no pleural effusions or pneumothorax . No free air is demonstrated . There are a few air - fluid levels projecting over the left upper quadrant , probably in the colon although not optimally assessed , with dense dependent portions suggesting recent contrast administration or ingestion of other hyperdense substance .
    OUTPUT:
    
Suspected minor atelectasis at the left lung base . No free air identified . Few air - fluid levels in the left upper quadrant , probably colonic , with suspected recent enteric contrast administration ; correlation with any recent contrast administration is suggested .