Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Both lungs appear clear with no focal consolidation . The cardiac silhouette is top normal . Mediastinal contour is unremarkable . On the lateral view , the left posterior pleural sulcus is blunted , either by a small effusion or pleural scarring . No acute rib fractures are noted , but if there is continued clinical concern then a dedicated rib series should be obtained , directed to the sites of focal physical findings .
    OUTPUT:
    
Possible small left pleural effusion . Findings were emailed to the ED ___ nurse for communication with the patient 's PCP on ___ at 9 : 12 am .