Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are hyperinflated and the lungs are clear . There is no pneumothorax or focal airspace consolidation . The heart is mild to moderately enlarged but unchanged from at least ___ . There is no evidence for pulmonary edema . Slight blunting of the costophrenic angles may reflect trace pleural effusions , unchanged . The mediastinal hilar structures are unremarkable .
    OUTPUT:
    
Unchanged , mild to moderate cardiomegaly without a superimposed acute intrathoracic process .