Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs again demonstrate moderate cardiomegaly and low lung volumes . The left pleural pigtail catheter is unchanged in position . Lung volumes are again low and there is unchanged bibasilar atelectasis . The left apical pneumothorax is unchanged . There is no pleural effusion . Multiple rib fractures are redemonstrated .
    OUTPUT:
    
Unchanged left apical pneumothorax .