Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normally expanded . Irregular opacity at the right base most likely reflects atelectasis although superimposed pneumonia can not be completely excluded . There is no large pleural effusion or pneumothorax . The heart is likely normal allowing for AP technique . The mediastinal and hilar contours are normal . There is mild pulmonary vascular congestion without frank pulmonary edema .
    OUTPUT:
    
Irregular opacity at the right base most likely reflects atelectasis although in the right clinical setting pneumonia can not be excluded .