Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . Opacity in the right lung base is new since ___ ; however , is relatively unchanged since ___ . This opacity could represent pneumonia or atelectasis . There is blunting of the right costophrenic angle which may represent a minimal right pleural effusion that is unchanged since ___ but new since ___ . Linear opacities in the left lung base most likely represent atelectasis . There is no left - sided pleural effusion . There is no pneumothorax . The cardiac and mediastinal contours are normal . Elevation of the right hemidiaphragm is stable since ___ .
    OUTPUT:
    
Opacity in the right lung base is new since ___ and may represent pneumonia or atelectasis . Minimal right pleural effusion , if any . The previously seen nodule in the right lung is not well seen on today 's study .