Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is grossly similar to the prior examination and mildly enlarged . There is bilateral hilar prominence . An opacity is seen adjacent the left heart border , in the left lower lobe , that in the appropriate clinical context may represent pneumonia . There are no specific findings suggestive of pulmonary embolus . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Left lower lobe opacity may be consistent with pneumonia in the appropriate clinical context . No specific evidence for pulmonary embolus . If there is persistent concern , CT of the chest can be obtained for evaluation .