Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is borderline enlarged . The mediastinal and hilar contours are unchanged . Pulmonary vasculature is not engorged . Patchy opacity within the left lower lobe may reflect atelectasis , but infection can not be excluded in the correct clinical setting . Right lung is clear . No pleural effusion or pneumothorax is seen . Fusion hardware within the cervical spine is incompletely imaged .
    OUTPUT:
    
Patchy left lower lobe opacity may reflect atelectasis , but infection can not be excluded in the correct clinical setting .