Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Query subtle focal opacity projecting over the right upper lobe medial to the EKG lead , may be artifactual from external artifact although an underlying focus of infection is not excluded . Elsewhere , no focal consolidation is seen . There is mild left base atelectasis . The cardiac silhouette is top - normal . Mediastinal contours are unremarkable . No pleural effusion or pneumothorax .
    OUTPUT:
    
Subtle focal opacity projecting over the right upper lung , projecting over the right anterior 2nd rib which could relate to external artifact , but focus of infection not excluded . Consider repeat with removal of external artifact in this region .