Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is again moderately enlarged . Central pulmonary arteries are mildly enlarged , similar to prior findings . There is no pleural effusion or pneumothorax . Elevation of the left hemidiaphragm suggests some volume loss at the left lung base .
    OUTPUT:
    
Stable appearance of the chest . No evidence for superimposed acute findings .