Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Irregular left perihilar opacity is again seen , better characterized by prior PET - CT . Additional linear opacity on the lateral view seen posteriorly is also unchanged likely atelectasis or scarring . Prior left lower lobectomy changes are again noted including volume loss on the left and pleural based thickening / scarring . There is no new consolidation or effusion . Cardiomediastinal silhouette is stable . No acute osseous abnormalities . Vascular stent projects over the left upper extremity and surgical clips project over the left chest laterally . Chronic deformities of the left ribs are also noted .
    OUTPUT:
    
No acute cardiopulmonary process . Additional details as above .