Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates a stable cardiomediastinal silhouette and pulmonary vasculature . Prominent bilateral hila are noted , corresponding to lymphadenopathy seen on recent CT . Since the prior examination , there is a left basilar opacity . There is no pleural effusion or pneumothorax . Clips are seen in the right axilla . Linear radiopaque density projecting over the right supraclavicular region , presumably external .
    OUTPUT:
    
Increased left basilar opacity since the comparison examination could be atelectasis though pneumonia is possible in the appropriate clinical context .