Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Normal postoperative appearance of the cardiomediastinum . Substantial left base atelectasis is new , with associated elevation of the left hemidiaphragm . Right lung is clear . Interval removal of the endotracheal tube , intra-aortic balloon pump , Swan - Ganz catheter and left chest tube is not associated with pneumothorax . Small left effusion is new .
    OUTPUT:
    
1 . Removal of various support tubes and lines without atelectasis . 2 . Substantial left base atelectasis with small effusion .