Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the chest radiograph obtained approximately 12 hours prior , the retrocardiac consolidation and left pleural effusion have increased in size . Lung aeration is minimally improved . Pulmonary vasculature remains prominent . No other significant changes .
    OUTPUT:
    
Worsening retrocardiac consolidation and left pleural effusion are concerning for a persistent left lower lobe pneumonia .