Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are normal . The lungs are clear , but the previously described nodular density in the right lower lung is not well appreciated on the current exam . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary process ; nonvisualization of previously described right lower lung nodular density , but this may be due to differences in patient potion .