Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: On frontal view , there is an asymmetric opacification at the right lung base . There is no silhouetting of the right heart border , opacification of the right hemidiaphragm , or opacification seen on lateral view . In view of the clinical setting , a developing pneumonia at the right lung base can not be excluded especially since this was the area of the previous pneumonia . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
A developing pneumonia at the right lung base can not be excluded .