Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A persistent patchy opacification in the left mid and lower lung fields , unchanged from the prior exam . The right lower lung aeration has improved from the prior exam with resolution of the previously seen opacity . Multiple small nodules are seen bilaterally , consistent with the patient 's known history of metastatic renal cell carcinoma . No new opacifications are present . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
1 . Improvement in right lower lobe aeration with resolution of previously seen opacity . 1 . Persistent left mid and lower lung opacification . 2 . Multiple pulmonary nodules , consistent with known history of metastatic renal cell carcinoma .