Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are within normal limits . The trachea is central . The cardiomediastinal contour . Is not enlarged . Heart size is at the upper limit of normal . Previous median sternotomy is noted . No pleural effusion , consolidation or pneumothorax seen . No fracture seen .
    OUTPUT:
    
No acute cardiopulmonary process , no significant interval change when compared to the prior study .