Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild to moderate pleural effusion with adjacent atelectasis at the left lung base is unchanged from the prior exam . There is minimal opacification at the right lung base which may also represent atelectasis . The cardiac , mediastinal and hilar contours are unremarkable . Old rib fractures are noted . Degenerative changes are present in both shoulders . Note is made of kyphosis . A small hiatal hernia is noted .
    OUTPUT:
    
1 . Mild to moderate left pleural effusion , unchanged from the prior examination . 2 . Small hiatal hernia .