Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate low lung volumes . Costophrenic angles are blunted , suggestive of trace pleural effusion . Right lung base opacity is minimal . Hilar and mediastinal silhouettes are unremarkable . Moderate cardiomegaly has improved . There is no pulmonary edema . No pneumothorax . Small hiatal hernia is noted .
    OUTPUT:
    
No good evidence for pneumonia . Aspiration may be undetectable . Improved moderate cardiomegaly .