Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to ___ , left - sided pleural effusion has minimally decreased and is now small . No visualized pneumothorax . Pulmonary edema has mildly improved . Substantial widening of the upper mediastinum is chronic and related to known dissection and mediastinal collection . Right - sided PICC has been removed .
    OUTPUT:
    
Minimal decrease in left - sided pleural effusion . No pneumothorax .