Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again visualized are bilateral heterogeneous parenchymal opacities , involving the left lung greater than right , with mid and lower lung predominance . This has decreased in comparison to the prior radiograph but increased in comparison to the more recent prior CT . Cardiac silhouette appears normal . Median sternotomy wires appear unchanged . Surgical clips are seen in the right upper lobe with adjacent scarring .
    OUTPUT:
    
Nonspecific asymmetrically distributed heterogeneous lung opacities , which may represent asymmetrical edema , multifocal aspiration or infection .