Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normally expanded and clear . The cardiomediastinal silhouette is borderline enlarged . Mild central pulmonary vascular prominence is unchanged . Mild peribronchial infiltration in the left lower lobe is new compared to one month prior . There is no pleural effusion or pneumothorax . Pectus excavatum deformity is redemonstrated .
    OUTPUT:
    
1 . Borderline enlarged heart 2 . Mild left lower lobe infiltrate may reflect non-specific inflammation and should be followed clinically and by radiography .