Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is persistent mild blunting of the right costophrenic angle which may be due to a small pleural effusion or pleural thickening . No focal consolidation is seen . There is no pneumothorax . The cardiac and mediastinal silhouettes are stable and unremarkable . No pulmonary edema is seen . There is no evidence of free air beneath the diaphragm .
    OUTPUT:
    
Persistent mild blunting of the right costophrenic angle may be due to a small pleural effusion or pleural thickening . No significant change from the prior study .