Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right central venous line ends in the mid SVC . The cardiomediastinal and hilar contours are within normal limits . There is platelike atelectasis in the left midlung . A retrocardiac opacity in the appropriate clinical setting may represent pneumonia . There is no fracture .
    OUTPUT:
    
A retrocardiac opacity in the appropriate clinical setting may represent pneumonia .