Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable view of the chest demonstrates low lung volumes which accentuate bronchovascular markings . There is right lower lobe airspace opacity , which is new since ___ exam . There is minimal blunting of the right costophrenic angle , suggestive of trace pleural effusion . There is no left pleural effusion . Left lung is essentially clear . No pneumothorax . Perihilar vascular congestion is noted . Hilar and mediastinal silhouettes are unchanged . Heart is mildly enlarged . Partially imaged upper abdomen is unremarkable .
    OUTPUT:
    
In comparison to ___ exam , there is new right lung base opacity , which may represent infection or aspiration in the appropriate clinical setting .