Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is persistent increased opacity in the right hemithorax . There is however improved aeration of the underlying right lung when compared to prior . There is no pneumothorax . There is no mediastinal shift . The left lung remains clear . No acute osseous abnormalities .
    OUTPUT:
    
Large right pleural effusion although improved aeration of the right lung when compared to exam from earlier the same day .