Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs were obtained . There is volume loss in the left lung compatible with history of left upper lobe lobectomy . Compared to prior study , there is now a small left pleural effusion with likely atelectasis at the left base . The right lung is essentially clear . The cardiomediastinal silhouette and hilar contours are stable . There is no pneumothorax . Left chest wall and subcutaneous emphysema is slightly improved since last study .
    OUTPUT:
    
1 . New left pleural effusion with left basilar atelectasis . Pneumonia can not be excluded in the appropriate clinical setting . 2 . Slightly improved left chest wall and subcutaneous emphysema .