Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral radiographs of the chest . The cardiomediastinal silhouette and hilar contours are unchanged . There is increased opacity in the left lower lobe concerning for pneumonia . There is persistent elevation of left hemidiaphragm . No pleural effusion or pneumothorax . There is mild pulmonary vascular congestion . No displaced rib fracture identified .
    OUTPUT:
    
Left lower lobe opacity concerning for pneumonia .