Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate low lung volumes . Linear opacities projecting over right lung base likely represent atelectasis . There is no right pleural effusion . Left hemidiaphragm is obscured by overlying opacity , which may represent atelectasis or infection . Left costophrenic angle is obscured , suggestive of trace pleural effusion . Hilar and mediastinal silhouettes are unremarkable . The heart size is normal . There is no pulmonary edema . No pneumothorax is seen . Partially imaged upper abdomen is unremarkable .
    OUTPUT:
    
Left lung base opacity , likely atelectasis or infection in the appropriate clinical setting with possible trace left pleural effusion .