Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The nodular area of density seen on the prior radiograph is faintly visualized on today 's study . This may represent developing infiltrate versus a lung nodule . CT scan for baseline assessment would be helpful . The rest of the lung fields are grossly clear . The cardiac silhouette and mediastinum is within normal limits .
    OUTPUT:
    
Faint density in the left mid lung zone , corresponding to the nodular density seen on the prior study . This may represent developing infiltrate or a pulmonary nodule . If there is high concern , a CT scan could be performed for further assessment .