Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is linear increased retrocardiac opacity , likely right lower ___ is new since ___ No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Retrocardiac opacity , likely right lower ___ , ___ represent pneumonia in the right clinical setting .