Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Left pleural catheter has been removed . There is persistently increased opacity in the left mid to low lung , with obscuration of the left hemidiaphragm and left heart border , likely reflecting a combination of pleural effusion and atelectasis related to the known spiculated mass in this region . The spiculated mass that was previously characterized on CT is not well seen in this radiograph study . In the appropriate clinical setting , superimposed pneumonia can not be excluded . The right lung is clear .
    OUTPUT:
    
Stable left mid-lower lung opacity , likely combination of pleural effusion and atelectasis related unknown spiculated lung mass . However , superimposed pneumonia can not be excluded .