Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Diffuse reticular and nodular opacities bilaterally are unchanged from the prior study . More focal opacity in the lingula has slightly increased from ___ , but is similar to ___ and may represent a waxing and waning abnormality . There is no new consolidation , and no pleural effusion or pneumothorax . Biapical pleural thickening is unchanged . The cardiac and mediastinal silhouettes and hilar contours are stable .
    OUTPUT:
    
Waxing and waning focal opacity in the lingula . Recommend treating for infection and repeating chest radiograph to ensure this area improves .