Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . There is retrocardiac opacity seen best on the lateral view as well as a new right basal opacity consistent with aspiration . There is no evidence of pneumothorax .
    OUTPUT:
    
Retrocardiac opacity and new right basal opacity consistent with aspiration .