Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrate the lungs are well expanded and clear . The heart is mildly enlarged , unchanged since the prior study , with suggestion of a small pericardial effusion , particulary on the lateral view . There is no pleural effusion , pulmonary edema , pneumothorax , or focal airspace opacity . There is no subdiaphragmatic free air .
    OUTPUT:
    
Mild cardiomegaly and possible small pericardial effusion , likely not clinically significant .