Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is patchy retrocardiac opacity and streaky right basilar opacity . Superiorly , lungs are clear . The cardiomediastinal silhouette is within normal limits . Tortuosity of the thoracic aorta is noted . No acute osseous abnormalities .
    OUTPUT:
    
Bibasilar opacities , left greater than right which could represent atelectasis though infection would certainly be possible in the proper clinical setting .