Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is increased opacity overlying the mid left lung which could represent increase in loculated fluid collection in the region of the previously described empyema ( CT dated ___ ) . Left - sided pleurX catheter remains unchanged position . Allowing for changes in position , the cardiomediastinal silhouette is unremarkable . There is blunting of the left costophrenic angle and associated opacity likely representing atelectasis , but an infectious process can not be ruled out .
    OUTPUT:
    
There is increased opacity overlying the mid left lung , which could represent an increase in loculated fluid collection in the region of the previously described empyema .