Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no intraperitoneal free air . Opacity within the right CP angle likely reflects atelectasis and a small pleural effusion . There is faint retrocardiac opacity . The lungs are otherwise clear . Cardiac silhouette and mediastinal contours are normal . There is no pneumothorax . There is gaseous distention of the stomach and left colon .
    OUTPUT:
    
1 . No intraperitoneal free air . 2 . Right CP angle and retrocardiac airspace opacity , likely reflects atelectasis and small right pleural effusion , although in the appropriate clinical setting pneumonia is not excluded .