Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen is dense retrocardiac opacity compatible with left basilar atelectasis and effusion . On the lateral view , the findings appear to have progressed . Known left hilar mass and mediastinal adenopathy was better seen on prior CT . Left mainstem bronchus stent is again seen . No acute osseous abnormalities . Surgical clips in the right upper quadrant are noted . No acute osseous abnormalities .
    OUTPUT:
    
Left basilar opacity , slightly worse compared to yesterday 's exam likely due to combination of atelectasis and effusion . Known left hilar mass and mediastinal adenopathy better seen on prior CT . No pneumothorax .