Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . A left thoracostomy tube is unchanged in position . Since the ___ examination there has been a slight increase in opacity throughout the left hemithorax , possibly representing slightly worsened effusion or worsening atelectasis . The right lung remains clear . A right IJ central venous catheter , left - sided pacemaker , and multiple intact sternal wires are unchanged in position . There is no right pneumothorax or right pleural effusion .
    OUTPUT:
    
Interval increase in opacity throughout the left hemithorax since ___ , possibly reflecting worsening atelectasis or increased fluid . No pneumothorax .