Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest is compared to previous exam from ___ . When compared to prior , there has been slight interval improvement of the left basilar opacity with blunting the left costophrenic angle and suggestive of effusion and possible associated atelectasis . Elsewhere , the lungs are clear . Cardiomediastinal silhouette is stable as are the osseous structures .
    OUTPUT:
    
Small persistent left basilar opacity suggestive of small effusion and possible atelectasis . Two - view chest x-ray may offer additional detail if desired .