Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is interval development of a moderate - sized right pleural effusion and associated atelectasis at the right base . The left lung is clear . There is no overt pulmonary edema . The cardiac silhouette is partially obscured and difficult to evaluate . The mediastinal contour is otherwise unremarkable . There is no pneumothorax . Bones and the upper abdomen are grossly unremarkable .
    OUTPUT:
    
Moderate size right pleural effusion and associated atelectasis . Superimposed consolidation can not be excluded .