Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the radiograph from 3 hr prior , there is no relevant change . No pulmonary edema or pneumonia . No pneumothorax . Left pleural effusion is slightly smaller . Right pleural effusion is unchanged . Moderate cardiomegaly is stable . This examination neither suggests nor excludes the possibility of pulmonary embolus .
    OUTPUT:
    
Minimally smaller left pleural effusion , otherwise no change .