Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Patient is known to have chronic collapse of the left lower lobe which accounts for the opacity in the retrocardiac region and volume loss in the left lung . Aside from this , the lungs appear clear without new consolidation , effusion or pneumothorax . Cardiomediastinal silhouette appears stable . No acute bony abnormalities are seen though degenerative changes are partially imaged at the right shoulder .
    OUTPUT:
    
Chronic left lower lobe collapse . Degenerative changes of the right shoulder . No acute findings .