Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left - sided chest tube is in place within a large left - sided probable loculated effusion , better assessed on prior CT from ___ , with compressive atelectasis of the left lower and upper lobes . No pneumothorax . The right lung is unremarkable without focal consolidation , effusion or pneumothorax . No central vascular congestion or overt pulmonary edema in the aerated portions of lung . Cardiac size is difficult to assess in the presence of a large effusion , though appears within normal limits .
    OUTPUT:
    
Left - sided chest tube present within a large , likely loculated left effusion with compressive atelectasis of the left lung . No pneumothorax .