Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . There is persistent opacification of the right lung base , and although this may be due to known mass but superimposed pneumonia could be considered . Lungs are hyperexpanded . There is a small right pleural effusion . There is mild cardiomegaly . The mediastinal and hilar contours are normal .
    OUTPUT:
    
Right lung base opacification , likely from known mass . However , if clinically appropriate , superimposed pneumonia can not be excluded .