Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a moderate right pleural effusion that partially obscures the right heart border . Bronchovascular markings are prominent , as before . There is evidence of compressive atelectasis at the right base . The lungs are otherwise clear . The aorta is mildly tortuous . There is evidence of a hiatal hernia . The heart and mediastinal structures are otherwise unremarkable . The bony thorax is grossly intact . Compared with the previous study pleural fluid has redistributed .
    OUTPUT:
    
Moderate right pleural effusion and evidence for underlying compressive atelectasis . Hiatal hernia .