Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval placement of a left pigtail catheter with minimal improved aeration of the left mid lung but persistent opacification of the remainder of the left hemithorax . The pigtail catheter appears somewhat folded distally . Large left pneumothorax is decreased in size with return of the mediastinum to midline . Small right pleural effusion is unchanged . The left heart border is obscured and heart size is not well evaluated . A left pacemaker has leads terminating in the right atrium and right ventricle . A right PICC terminates in the mid SVC . Atelectasis at the right base is unchanged . There is no large pneumothorax . The thoracic aorta is calcified .
    OUTPUT:
    
1 . Large left pleural effusion is smaller with slight improvement in aeration of the left mid lung and return of the mediastinum to the midline . The pigtail catheter appears to be folded distally although this may be projectional . 2 . Right pleural effusion and right basilar atelectasis are unchanged .