Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The endotracheal tube is unchanged in position , 8 .6 cm above the carinal . Overlying skin ___ and posterior lumbar fusion hardware are partially visualized . Again seen is a dense left retrocardiac opacity , stable since the prior examination , reflecting left lower lobe collapse . A soft tissue mass overlying the left hemi thorax and involving the left fourth rib is again seen , better visualized on the dedicated CT performed on the same day . There is no pneumothorax .
    OUTPUT:
    
1 . Unchanged left lower lobe collapse . 2 . Large soft tissue mass overlying the left hemi thorax , with involvement of the left fourth rib , better seen on the dedicated chest CT .