Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no significant change from radiograph earlier this morning . Small left apical pneumothorax is stable . Small left pleural effusion increased from ___ . Left chest tube , multiple rib fractures , and subcutaneous emphysema are unchanged . Mediastinal contours and hila are normal . Retrocardiac opacity could represent atelectasis or pneumonia .
    OUTPUT:
    
1 . Stable small left apical pneumothorax . 2 . Retrocardiac opacity could represent atelectasis or pneumonia . 3 . Small left pleural effusion increased from ___ , correlation with chest tube output is recommended to exclude active hemorrhage .