Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Opacity at the left base is probably atelectasis and scarring , less likely infection . Pulmonary vasculature is indistinct , similar to ___ , compatible with pulmonary vascular congestion without overt pulmonary edema . Cardiac enlargement and mediastinal silhouette are stable . Median sternotomy wires are intact . Right hemidiaphragmatic elevation is unchanged . Blunting of the left costophrenic sulcus is unchanged from ___ , likely due to scarring . Degenerative change is seen in the shoulder girdles bilaterally , incompletely evaluated on this study .
    OUTPUT:
    
1 . Mild congestive heart failure without overt pulmonary edema . 2 . Left basilar opacity is likely atelectasis and scarring , less likely infection .