Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and 2 lateral views of the chest . Better seen on the lateral exam is a small area of opacity projecting over the cardiac shadow on both lateral views . There is no definite correlate on the frontal however it may localize to the left . The lungs are otherwise clear . Cardiomediastinal silhouette is within normal limits . No acute osseous abnormality detected . No free air is seen below the diaphragm .
    OUTPUT:
    
Focal opacity best seen on the lateral view projecting over the cardiac shadow , potentially localizing to the left . This was not identified on remote prior and may represent atelectasis however a developing infection is also possible in the proper clinical setting .