Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low . Right pleural effusion is overall unchanged . Persistent rightward shift of the mediastinum suggest component of right lung volume loss . The left lung is clear . Although the right heart border is obscured mild cardiomegaly is likely unchanged . There is no evidence of pulmonary edema . There is no pneumothorax .
    OUTPUT:
    
1 . No significant change in right pleural effusion . 2 . Right lung atelectasis resulting in persistent rightward shift of the mediastinum . 3 . No pulmonary edema .