Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided demonstrating no confluent consolidation , effusion or pneumothorax . There is probable mild atelectasis in the lower lungs which appears similar to prior exam . Superimposed breast tissue may account for the subtle lower lung opacities seen on this radiograph as well as the prior radiograph of the chest . Please note , given this appearance , a very early pneumonia would be difficult to exclude . Cardiomediastinal silhouette is stable . Bony structures are intact . No free air below the right hemidiaphragm . Clips are seen in the right upper quadrant .
    OUTPUT:
    
As seen on prior exams , subtle lower lung opacities likely represent atelectasis versus superimposed breast tissue though an early pneumonia is impossible to exclude .