Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left chest wall pacemaker is seen with leads in unchanged position . Since the prior radiograph , there appears to be increased consolidation at the left base with obscuration of the left hemidiaphragm , possibly due to volume loss ; however , this may be due to technical reasons . The right lung is clear . Cardiomediastinal silhouette is unchanged .
    OUTPUT:
    
Increased opacification of the left retrocardiac region and base , which may be due to increased volume loss or technical reasons .