Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate - to - large right pleural effusion , accompanying right lung atelectasis is unchanged since ___ . Increased retrocardiac density on the left side and reflecting left lower lung volume loss and probably small left pleural effusion is also similar . Right internal jugular catheter sheath tip is at upper / mid SVC . There is evidence of prior median sternotomy and sternal sutures are intact , consistent with status post AVR . Mild to moderately enlarged heart size and minimally widened mediastinum suggesting mediastinal congestion is unchanged .
    OUTPUT:
    
Over last 24 hours , moderate - to - large pleural effusion accompanying right lung atelectasis and increased retrocardiac density reflecting volume loss and small effusion are all unchanged .