Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Apparent slight enlargement of the cardiac silhouette in comparison to prior chest x-ray from ___ likely relates to lower lung volumes and AP technique . The cardiomediastinal contours are otherwise stable and within normal limits , with unchanged aortic arch calcifications . The bilateral hila are unremarkable . The lungs are clear without focal consolidation . There is no evidence of pulmonary vascular congestion . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
No acute cardiopulmonary process .