Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lateral left base / lingular relative linear opacities seen , which may be due to atelectasis and is without clear correlate on the lateral view , however , an infectious process is not excluded in the appropriate clinical setting . No pleural effusion or evidence of pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Lateral left lung base opacity , relatively linear in configuration , may be due to atelectasis however , infectious process is not excluded in the appropriate clinical setting .