Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the chest radiograph obtained 1 day prior , there is a new , small left pleural effusion new antenatal retrocardiac consolidation with air bronchograms . Lung volumes remain low . Engorgement of the pulmonary vasculature is unchanged .
    OUTPUT:
    
New retrocardiac consolidation and small , left pleural effusion is concerning for a developing left lower lobe pneumonia .