Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate low lung volumes . Left lung base opacity , best seen on the lateral view , is noted . Hilar and mediastinal silhouettes are unchanged . Multiple surgical clips project over cardiac silhouette . Sternotomy wires are in place . Partially imaged upper abdomen is unremarkable . There is no pulmonary edema . Partially imaged upper abdomen is unremarkable .
    OUTPUT:
    
Left lung base opacity , may represent atelectasis or infection in the appropriate clinical setting .