Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the most recent comparison radiograph , the lungs are better inflated , and there is worsened airspace opacification in the left mid lung . Left hilus is asymmetrically enlarged compared to the right , possibly due to lymphadenopathy . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Increased airspace opacity in the left lower lobe compared to ___ . Findings are concerning for infection , however in the setting of known malignancy and the appropriate timing of radiation therapy , this could represent progression of post radiation fibrosis / scarring with or without local recurrence .