Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There is slight increased opacity at the left lung base , which could in part relate to overlying soft tissue , though underlying consolidation may be present . The right lung is clear . No pleural effusion or pneumothorax is seen . Cardiac and mediastinal silhouettes are stable . Again seen is a dual - lead left - sided pacemaker with leads extending to the expected positions in the right atrium and right ventricle , unchanged .
    OUTPUT:
    
Right base opacity could be due to pneumonia .