Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung hyperinflation , including flattening of the hemidiaphragms , is most likely due to COPD . Mild ground - glass opacities in the bilateral lower lungs likely represent an atypical infection similar to opacities seen on the previous CT on ___ . A typical pyogenic infection would likely have more confluent opacities . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
1 . Bilateral ground - glass opacities likely represent an atypical infection . 2 . Stable severe COPD .