Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are new , subtle right basilar opacities . Linear atelectasis in the mid left lung is similar . Subtle l left ower lobe opacities likely corresponding to scarring or atelectasis seen on recent outside hospital CT are also unchanged . There is possibly a trace left pleural effusion . No pneumothorax . Mild elevation of the left hemidiaphragm is unchanged . Heart size is normal and cardiomediastinal hilar silhouettes are stable .
    OUTPUT:
    
1 . Possible right lower lobe pneumonia or atelectasis . Alternatively , pulmonary embolism could be considered in the appropriate clinical setting . If further evaluation for potential pulmonary embolism is desired , chest CTA is the appropriate study . If the patient is treated for pneumonia , recommend follow - up radiograph in 6 weeks to assess for changes . 2 . Atelectasis and scarring in the lower left lung are unchanged .