Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single frontal upright view of the chest was obtained portably . Low lung volumes result in bronchovascular crowding . Left basilar opacity is new from the study six hours earlier and may represent atelectasis versus aspiration . There is a possible associated pleural effusion . There is no free air under the right hemidiaphragm . Right atelectasis is noted . There is a hiatal hernia with air in the esophagus .
    OUTPUT:
    
1 . No free air . 2 . Left basilar opacity may represent aspiration or atelectasis , new from 6 hours prior . Possible associated effusion .