Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are lower than on the prior study . There is no focal consolidation , pleural effusion or pneumothorax . Mild cardiomegaly is accentuated by lower lung volumes . Mediastinal silhouette and hilar contours are stable . Degenerative change in the thoracic spine is again noted .
    OUTPUT:
    
No pneumonia , edema or effusion .