Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Relative patchy opacity in the left lung base on the frontal view is not well substantiated on the lateral view and could be due to atelectasis or early infection . No large pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable . Partially imaged is cervical hardware in the lower cervical spine .
    OUTPUT:
    
Patchy left base opacity only seen on the frontal views , could be due to atelectasis , although infectious process is not excluded in the appropriate clinical setting .