Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate a normal cardiomediastinal silhouette and moderately well - aerated lungs . There are persistent but improved left lower lobe opacities , consistent with evolution of known pneumonia . No new focal consolidation is identified . There is no appreciable effusion or pneumothorax . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
Persistent but improved left lower lobe opacities , consistent with evolution of a known pneumonia . No new focal consolidation identified .