Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Persistent right pleural effusion noted likely with associated compressive right lower lung atelectasis , difficult to exclude pneumonia . No pneumothorax is seen . Left lung remains clear . Heart size is unchanged . Mediastinal contour is unremarkable . Bony structures are intact .
    OUTPUT:
    
Persistent small right pleural effusion with associated compress the right lower lung atelectasis , difficult to exclude a superimposed pneumonia at the right lung base .