Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a new focal opacity in the right upper lobe . There is likely atelectasis at the left lung base . The cardiomediastinal silhouette and hilar contours are stable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Focal opacity at the right upper lobe , new since prior studies , is concerning for infection or infarction . If a prior right subclavian line attempt was made , this may represent a hematoma . A CTA chest is recommended for further evaluation .