Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart contour size in the upper range of normal limits but is slightly increased in size since ___ . This could reflect physiological change due to the cardiac cycle or real interval change in the cardiac diameter . The lungs are otherwise clear . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
1 . There are no significant lung abnormalities . 2 . Cardiac contour is in the upper normal range but has slightly increased since ___ ; this could reflect changes in the cardiac cycle phase or true interval enlargement .