Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right PICC is unchanged with tip in the lower SVC . There is a partially visualized esophageal stent . The pulmonary vasculature is normal . Underlying emphysema . There is a persistent large round opacity in the lower left hemithorax , corresponding to the loculated effusion with adjacent atelectasis seen on prior CT . Known hydropneumothorax component is better seen on the CT . Note is also made of focal high density material adjacent to left heart border , possibly representing aspirated barium , more fully characterized on the CT as well . Lungs are otherwise clear . No right pleural effusion . Small left pleural effusion . No pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Again seen is a large round opacity in the left lower hemithorax , corresponding to the loculated effusion seen on prior CT of 1 day earlier .