Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouette and pulmonary vasculature are normal . A consolidation is noted in the left lower lobe in the retrocardiac region . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Left lower lobe pneumonia . Follow - up x-ray can be obtained to document resolution .